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Essential Knowledge

Practical knowledge worth preserving, grouped by discipline and linked to lawful full-text editions.

106 entries

Bushcraft

Camping and Woodcraft

Horace Kephart

The classic American handbook of shelter, fire, cordage, camp cooking and travelling light in wooded country.

The Book of Woodcraft and Indian Lore

Ernest Thompson Seton

Tracking, firecraft, knots, signalling and wilderness living skills, illustrated throughout by the author.

Survival

Scouting for Boys

Robert Baden-Powell

Practical field skills, observation, first aid and self-reliance drills that founded the scouting movement.

Survival (FM 21-76)

US Department of the Army

Government field manual covering shelter, signalling, edible plants, water procurement and survival medicine.

Basic Biology

On the Origin of Species

Charles Darwin

The foundational account of evolution by natural selection, in its first edition text.

Anatomy of the Human Body

Henry Gray

The standard descriptive anatomy of bones, muscles, vessels and organs, with the classic plates.

Basic Chemistry

The Chemical History of a Candle

Michael Faraday

Six lectures deriving combustion, gases, oxidation and respiration from a single burning candle.

An Elementary Study of Chemistry

William McPherson and William Henderson

A complete first course: elements, reactions, acids and bases, with bench experiments using simple apparatus.

Basic Physics

Relativity: The Special and General Theory

Albert Einstein

Einstein's own non-technical exposition of special and general relativity.

Opticks

Isaac Newton

Experiments on light, refraction, colour and the spectrum, described so they can be repeated.

Mathematics

The Thirteen Books of Euclid's Elements

Euclid, translated by Thomas Heath

Plane and solid geometry, proportion and number theory built from definitions and postulates.

Calculus Made Easy

Silvanus P. Thompson

Differential and integral calculus taught plainly, with worked practical examples.

Engineering

Machinery's Handbook (early editions)

Erik Oberg and Franklin Jones

Reference tables for threads, gears, tolerances, materials and shop mathematics used across engineering trades.

The Steam Engine Explained and Illustrated

Dionysius Lardner

How boilers, valves, condensers and governors work, with the mechanics of each part.

Mechanics

Audels Engineers and Mechanics Guide

Frank D. Graham

Bearings, belts, pumps, gearing and engine maintenance explained for working mechanics.

The Gas Engine Handbook

E. W. Roberts

Internal combustion engine construction, ignition, carburetion and fault finding.

Agriculture

Soils and Crops of the Farm

George E. Morrow and Thomas F. Hunt

Soil structure, rotation, manuring and the practical management of staple field crops.

Farmers of Forty Centuries

F. H. King

A field study of permanent agriculture in China, Korea and Japan: composting, irrigation and soil fertility without industrial inputs.

Food Preservation

Canning, Preserving and Pickling

Marion Harris Neil

Home methods for jars, brines, syrups, drying and safe processing times.

Complete Guide to Home Canning

United States Department of Agriculture

Current authoritative guidance on acidity, pressure canning and preventing spoilage and botulism.

  • Read OnlineUSDA / National Center for Home Food PreservationFull Text

Water Purification

Guidelines for Drinking-water Quality

World Health Organization

Standards and field methods for filtration, chlorination, boiling, solar disinfection and safe storage.

Water Supply and Sanitation in Rural Areas

US Public Health Service

Well siting, spring protection, slow sand filtration and simple disinfection practice.

First Aid & Medicine

Where There Is No Doctor

David Werner

Village healthcare handbook: diagnosis, wound care, infection, childbirth and drug use where no clinic exists.

First Aid to the Injured

Peter Shepherd (St John Ambulance)

Bleeding control, fractures, burns, resuscitation and casualty movement, taught step by step.

Leechdoms, Wortcunning and Starcraft of Early England

Oswald Cockayne (ed.)

Anglo-Saxon medical corpus including Bald's Leechbook, with Old English text and facing English translation: herbal remedies, salves, wound treatment and surgery.

Navigation

The American Practical Navigator (Bowditch)

Nathaniel Bowditch

Celestial and coastal navigation, dead reckoning, charts, tides and the mathematics of position finding.

Map Reading and Land Navigation

US Department of the Army

Grid systems, contour interpretation, compass work, resection and night navigation.

Communications

The Radio Amateur's Handbook

American Radio Relay League

Radio theory, antennas, transmitters, receivers and propagation for building and repairing sets.

The Principles Underlying Radio Communication

US Signal Corps / Bureau of Standards

Signalling fundamentals from spark sets to vacuum tubes, with circuit diagrams.

Construction

Audels Carpenters and Builders Guide

Frank D. Graham

Framing, roofing, stairs, foundations and layout for timber construction.

Building with Earth: Handbook of Simple Building

US Department of Agriculture

Rammed earth and adobe walls, mortars, curing and structural limits for low-cost building.

Electricity

Hawkins Electrical Guide

Nehemiah Hawkins

Generators, motors, wiring, batteries and lighting explained from first principles with diagrams.

Experimental Electricity for Boys

Alfred P. Morgan

Building cells, coils, magnets, telegraphs and simple motors from scrap materials.

Metalworking

Practical Blacksmithing

M. T. Richardson

Forge construction, heat colours, welding, tempering and toolmaking from working smiths.

Foundry Work

Frank Stanley

Moulding sand, patterns, cores, cupola melting and pouring of iron and non-ferrous metals.

Woodworking

Woodwork Joints

William Fairham

Every principal joint — mortise, dovetail, scarf, halving — with cutting sequence and uses.

Handwork in Wood

William Noyes

Timber properties, seasoning, sharpening, hand tool technique and simple wood machinery.

Food Growing

The Vegetable Garden

Marie Vilmorin-Andrieux

A comprehensive reference on vegetable varieties, sowing, cultivation and seed saving.

Gardening for Profit

Peter Henderson

Market gardening at scale: beds, frames, succession planting, manures and storage.

Animal Husbandry

Farm Animals

E. V. Wilcox

Breeding, feeding, housing and disease prevention for cattle, sheep, pigs, horses and poultry.

ABC and XYZ of Bee Culture

A. I. Root and E. R. Root

Hive management, swarming, wintering, honey extraction and bee disease.

World History

The Outline of History

H. G. Wells

A single continuous narrative from the formation of the earth through empires, religions and the modern nation state.

The History of the Decline and Fall of the Roman Empire

Edward Gibbon

The classic six-volume study of how a dominant civilisation lost cohesion, currency, frontier and finally itself.

The Histories

Herodotus

The first work of narrative history: Persia, Egypt and Greece described through enquiry, testimony and travel.

History of the Peloponnesian War

Thucydides

A contemporary account of a long war between democracies and oligarchies, and the political decay it produced.

Ancient Civilisations

A History of Egypt

James Henry Breasted

Dynastic Egypt from the earliest kings to Roman conquest, drawn from monuments and inscriptions.

Myths and Legends of Babylonia and Assyria

Lewis Spence

Mesopotamian cosmology, kingship and law traced through surviving tablets and epics.

The Code of Hammurabi

translated by L. W. King

One of the earliest surviving legal codes: property, contract, injury and penalty in Old Babylon.

Military History & Strategy

The Art of War

Sun Tzu

Terse maxims on terrain, deception, supply and the economics of conflict.

On War

Carl von Clausewitz

The theory of war as an extension of politics: friction, chance, centre of gravity and moral force.

The Gallic Wars

Julius Caesar

A commander's own campaign record: logistics, engineering, siegecraft and the politics of conquest.

Political Philosophy

The Republic

Plato

Justice, the ideal city, education of rulers and the degeneration of political forms.

Leviathan

Thomas Hobbes

Sovereignty derived from fear and contract; the state as the condition of civil peace.

Second Treatise of Government

John Locke

Natural rights, property, consent and the right of a people to dissolve a government.

The Prince

Niccolò Machiavelli

How power is actually acquired, held and lost, stripped of moral idealisation.

On Liberty

John Stuart Mill

The limits of state and social coercion over the individual, and the case for free expression.

Economics

An Inquiry into the Nature and Causes of the Wealth of Nations

Adam Smith

Division of labour, prices, wages, rent and the mechanics of markets and public revenue.

On the Principles of Political Economy and Taxation

David Ricardo

Rent, comparative advantage and the distribution of output between classes.

Capital, Volume I

Karl Marx

A critique of commodity production, surplus value and the accumulation dynamics of industrial capitalism.

The Economic Consequences of the Peace

John Maynard Keynes

How reparations, currency collapse and trade disruption follow a badly settled war.

Progress and Poverty

Henry George

Why material progress can coexist with deepening want, and the land question behind it.

Social Systems & Sociology

The Division of Labour in Society

Émile Durkheim

How specialisation binds or fragments a society, and the conditions of social solidarity.

The Protestant Ethic and the Spirit of Capitalism

Max Weber

The cultural and religious origins of disciplined work, saving and rational enterprise.

Democracy in America

Alexis de Tocqueville

Associations, local self-government, equality and the social habits that sustain a republic.

Mutual Aid: A Factor of Evolution

Peter Kropotkin

Cooperation, guilds, village commons and voluntary organisation as engines of survival.

The Crowd: A Study of the Popular Mind

Gustave Le Bon

Early analysis of mass psychology, suggestion and the behaviour of assemblies.

Law & Governance

Commentaries on the Laws of England

William Blackstone

The systematic exposition of common law: persons, property, private wrongs and public wrongs.

The Federalist Papers

Hamilton, Madison and Jay

Argument-by-argument design of a federal constitution: factions, checks, courts and taxation.

The Social Contract

Jean-Jacques Rousseau

Legitimacy, the general will and the forms a government may lawfully take.

Anthropology & Folklore

The Golden Bough

James George Frazer

A comparative survey of magic, kingship, sacrifice and seasonal ritual across cultures.

Ancient Society

Lewis Henry Morgan

Kinship, clan organisation and property in early societies, from field observation.

Argonauts of the Western Pacific

Bronisław Malinowski

The kula exchange system: gift economies, reciprocity and reputation in island trade.

Psychology

The Principles of Psychology

William James

Habit, attention, memory, emotion and will treated as natural functions of a living organism.

The Interpretation of Dreams

Sigmund Freud

The founding text of psychoanalytic method: dream work, symbolism and unconscious motive.

Conditioned Reflexes

Ivan Pavlov

Experimental conditioning: stimulus, response, extinction and the physiology of learning.

Philosophy & Ethics

Nicomachean Ethics

Aristotle

Virtue as trained disposition, the mean, friendship and the ends of a good life.

Meditations

Marcus Aurelius

Private Stoic notes on duty, mortality, temper and what is and is not within one's control.

An Essay Concerning Human Understanding

John Locke

Where ideas come from, the limits of knowledge, and how words mislead reasoning.

Novum Organum

Francis Bacon

The case for inductive experiment over inherited authority — the method behind modern science.

Religion & Mythology

Sacred Books of the East

edited by Max Müller

Translations of Vedic, Buddhist, Zoroastrian, Confucian and Islamic primary texts.

Bulfinch's Mythology

Thomas Bulfinch

Greek, Roman, Norse and Arthurian myth collected as a single narrative reference.

The Varieties of Religious Experience

William James

Conversion, mysticism and saintliness examined as psychological phenomena.

Language & Rhetoric

The Elements of Style

William Strunk Jr.

Concise rules of usage, composition and plain expression.

Rhetoric

Aristotle

Persuasion analysed into character, emotion and argument, with the structure of speeches.

Roget's Thesaurus of English Words and Phrases

Peter Mark Roget

Vocabulary organised by concept rather than alphabet — a map of expressible ideas.

Astronomy

On the Revolutions of the Heavenly Spheres

Nicolaus Copernicus

The heliocentric model set out with geometry and observational tables.

Dialogue Concerning the Two Chief World Systems

Galileo Galilei

Ptolemaic versus Copernican cosmology argued through observation, tides and motion.

A Field Book of the Stars

William Tyler Olcott

Naked-eye constellation identification by season, with charts for orientation and timekeeping.

Geology & Earth Sciences

Principles of Geology

Charles Lyell

Slow, present-day processes as the explanation of the earth's structure and deep past.

The Geological Story Briefly Told

James D. Dana

Rock types, strata, fossils and mineral identification for practical field use.

Cartography & Exploration

The Art of Travel

Francis Galton

Shifts and contrivances for wild countries: camps, rafts, rations, surveying and repairs.

The Principal Navigations, Voyages and Discoveries

Richard Hakluyt

First-hand voyage accounts collected as a record of early modern exploration and trade routes.

A Treatise on Surveying

John Gummere

Chain, compass and level work: traverses, areas, boundaries and mapping from measurement.

Art & Architecture

The Ten Books on Architecture

Vitruvius

Roman building practice: materials, proportion, water supply, machines and town siting.

The Seven Lamps of Architecture

John Ruskin

Principles of truthful construction, ornament and the ethics of building well.

The Grammar of Ornament

Owen Jones

A comparative atlas of decorative systems from Egyptian to Renaissance, in colour plates.

Music

Harmony: A Course of Study

George Whitefield Chadwick

Chords, voice leading, cadence and modulation taught through written exercises.

On the Sensations of Tone

Hermann von Helmholtz

The physics and physiology of pitch, timbre, consonance and musical scales.

Education & Learning

Democracy and Education

John Dewey

Learning by doing, the social function of schooling and how curricula shape citizens.

The Montessori Method

Maria Montessori

Prepared environments, self-directed work and sensory materials for early learning.

Textiles & Clothing

A Handbook of Weaves

G. H. Oelsner

Hundreds of weave structures diagrammed for loom setup and cloth design.

The Dyeing of Textile Fabrics

J. J. Hummel

Natural and synthetic dyes, mordants, fastness and practical vat procedure.

The Art of Boot and Shoemaking

John Bedford Leno

Lasts, patterns, stitching and repair for durable footwear made by hand.

Trade, Money & Commerce

Bookkeeping and Accountancy

Arthur Lisle

Double-entry method from first principles: ledgers, trial balance and final accounts.

Lombard Street: A Description of the Money Market

Walter Bagehot

How banking reserves, credit and panics actually work, and the lender of last resort.

A History of the Precious Metals

Alexander Del Mar

Coinage, debasement and monetary standards traced across states and centuries.