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Offline library: what to keep

Books, manuals, maps and files worth storing on paper and on a device before you need them.

1 Knowledge

Store knowledge like you store food

This manual is a start. Real depth is in books written by people who spent their lives on one subject. Get them now, while shops and the internet still work.

Keep knowledge in three forms, each failing in a different way: paper (survives with no power, fails in water and fire), devices (hold thousands of books, fail without charge or when dropped) and people (skills practised now, lost if not taught on).

1. Paper for what can kill you

Medical, water treatment, food safety, electrical safety. You must be able to read it with no power, in a hurry.

2. Devices for everything else

An offline encyclopaedia, repair guides, maps and hundreds of books fit on one phone or USB stick.

3. Two copies, two places

One at home, one elsewhere (relative, car, garden shed). Fire or theft should not take everything.

2 Paper

Books worth owning

Grouped by chapter. free marks those free to download legally; the rest are in print and often cheap second-hand.

General and self-sufficiency

The Self-Sufficient Life and How to Live It

John Seymour. The classic for a smallholding in a European climate: garden, animals, grain, brewing, crafts.

The Encyclopedia of Country Living

Carla Emery. Huge, practical, everything from goats to soap to butchering.

The Knowledge: How to Rebuild Our World from Scratch

Lewis Dartnell. The science behind making things again: chemistry, materials, medicine, power.

SAS Survival Handbook

John "Lofty" Wiseman. Short-term wilderness survival, compact enough for a pack.

US Army Survival manual (FM 21-76 / FM 3-05.70)free

Public domain. Shelter, water, fire, navigation, plants, signalling.

Medical

Where There Is No Doctorfree

David Werner, Hesperian. Written for villages without a doctor: diagnosis, treatment, medicines and doses in plain language. The first book to print.

Where There Is No Dentistfree

Murray Dickson, Hesperian. Toothache, abscess, extraction, prevention.

A Book for Midwivesfree

Hesperian. Pregnancy, birth, complications, newborn care.

Survival and Austere Medicinefree

Volunteer-written guide for long-term care with limited supplies, including improvised equipment.

Oxford Handbook of Wilderness and Expedition Medicine

Pocket-sized, doctor level, far from hospitals.

A first-aid manual from your national Red Cross

Matches local practice and the course you should take.

Water and sanitation

WHO / WEDC Technical notes on drinking-water, sanitation and hygiene in emergenciesfree

Short illustrated sheets: chlorination, wells, latrines, quantities.

The Sphere Handbookfree

Humanitarian minimum standards: water per person, toilets per person, food, shelter.

The Humanure Handbookfree

Joseph Jenkins. Safe composting toilets, with the temperatures and times.

A Community Guide to Environmental Healthfree

Hesperian. Water, sanitation, waste, pesticides, for communities doing it themselves.

Growing food

The Resilient Gardener

Carol Deppe. Growing staple calories (potatoes, corn, beans, squash, eggs) in hard times. Matches the land calculator.

How to Grow More Vegetables

John Jeavons. Biointensive beds, yields and the land needed to feed one person.

Seed to Seed

Suzanne Ashworth. How to save seed from every common vegetable: isolation distances, population sizes.

Four-Season Harvest

Eliot Coleman. Fresh food through winter with cold frames and unheated tunnels.

A regional gardening guide

Sowing dates and varieties for your own climate beat any international book.

Foraging

Food for Free

Richard Mabey. Wild food of Britain and north-west Europe, pocket size.

A photo field guide to fungi for your country

Several books with good photos, cross-checked. Never trust one picture, and never an app, with a mushroom.

A wild flower guide with keys

Identify plants from leaves and flowers, especially the deadly carrot-family look-alikes.

Preserving and cooking

USDA Complete Guide to Home Canningfree

Tested times and pressures. The safety reference for bottling low-acid food.

Ball Complete Book of Home Preserving

Hundreds of tested recipes: jams, pickles, pressure canning.

Preserving Food without Freezing or Canning

Terre Vivante gardeners. Old French methods: drying, salt, oil, lactic fermentation, cellars.

The Art of Fermentation

Sandor Katz. Sauerkraut to sourdough to vinegar; why it works and what goes wrong.

A basic cookbook

Bread from flour, stock from bones, beans from dry. Cooking from raw ingredients is a survival skill.

Animals

Storey's Guides (chickens, rabbits, goats, bees)

One per animal. Housing, feeding, breeding, disease, slaughter.

A veterinary guide for smallholders

Common diseases, birthing problems, when to cull.

Home butchery book

With cutting diagrams for the animals you keep and hunt.

Electricity

Mobile Solar Power Made Easy

William Prowse. Small 12 V systems explained with wiring diagrams and wire and fuse sizes.

Photovoltaics: Design and Installation Manual

Solar Energy International. Proper system design, safety, battery banks.

Practical Electronics for Inventors

Scherz and Monk. From Ohm's law to building and repairing circuits.

Your country's wiring regulations guide

For anything touching 230 V mains.

Workshop and repair

Workshop manual for each vehicle and engine you own

Haynes or the manufacturer's service manual: torque values, timing, wiring diagrams.

Machinery's Handbook

Threads, materials, heat treatment, tolerances. The machinist's bible, older editions are fine.

Small Gas Engines

Goodheart-Willcox. Two- and four-stroke engines: chainsaws, pumps, generators.

A general home repair manual

Plumbing, carpentry, roofs, masonry, glass. Reader's Digest style books are cheap second-hand.

The Ashley Book of Knots

Or any good knot book; knots are used every day.

Radio and navigation

ARRL Handbook and ARRL Antenna Book

Radio theory, building and repairing radios, every antenna type.

Your national amateur licence study guide

The fastest route to a licence and to working radio (Comms).

Be Expert with Map and Compass

Björn Kjellström. Orienteering-based navigation, clear and short.

3 Download

Free downloads to get today

All legal and free. Download, then print the medical ones.

4 Device

An encyclopaedia in your pocket

All of Wikipedia, medical wikis, repair guides and question-and-answer sites run offline on a phone or laptop.

Kiwix is a free reader for compressed website copies (ZIM files) on Android, iPhone, Windows, macOS and Linux. Download the app, then the files you want over Wi-Fi. Most come in versions with and without pictures; sizes change with every release, so check before downloading.

CollectionWhat forSize, roughly
Wikipedia, English, full with picturesEverything~100 GB
Wikipedia, no picturesEverything, text only~50 GB
Wikipedia "top" / "mini" selectionsMost-read articles, fits any phonea few GB or less
WikiMed (medical Wikipedia)Diseases, drugs, anatomy1–2 GB
iFixitRepair guides with photos for phones, appliances, cars, toolsseveral GB
Wikibooks, WikivoyageTextbooks and cookbooks; travel and local maps1–5 GB
Stack Exchange sitesAnswers on gardening, DIY, electronics, cooking, ham radioMB to GB each
Project GutenbergPublic-domain books~70 GB all, pick topics
Where to put it

A cheap 256 GB microSD card or USB stick holds all of this. Keep one in the phone and one copy sealed in a bag with a small laptop or old tablet that has Kiwix installed and has been tested offline.

5 Maps

Maps: paper and offline

Online maps disappear with the network. Store your area twice: on paper and in an offline app.

Paper topographic maps

1:25 000 for your home area (every path, spring and building), 1:50 000 for the region, a road atlas for the country. Waterproof versions or a map case. Mark water sources, shops, pharmacies, fuel stations, hospitals, friends.

Offline map apps

Organic Maps and OsmAnd use OpenStreetMap and work fully offline with the phone's GPS, which needs no network. Download your country and neighbours now; add contour lines in OsmAnd.

Special maps

Geology and soil maps (for wells and farming), flood risk maps, forest and land ownership, historic maps showing old wells, mills and springs.

Navigation skills

A map is only useful if you can read it. Practise with a compass now (Navigation).

6 Print

Print these pages first

Browser menu → Print on any chapter gives a clean black-and-white layout. Put the sheets in plastic sleeves in a ring binder.

Binder, in this order

7 Personal

Your own papers and local knowledge

No book contains your prescriptions, your neighbours' skills or where your water pipe runs.

Copies on paper and on the stick

Keep it safe

Encrypt the digital copy of identity and bank documents (an encrypted archive or encrypted USB stick, password written on paper stored separately), and keep the paper copies in a sealed bag inside a fire-resistant box.

8 Kit

The offline library kit

What it takes to keep reading when the grid is down.

Library kit

Batteries in storage

Store lithium devices at about half charge, somewhere cool, and top them up every 6 months. A fully flat lithium battery left for a year may never charge again.

Pass it on

The most durable library is people. Teach children and neighbours what you learn, and write down what works in your place, your soil and your climate.