- Encyclopedia of Astronomy and Astrophysics
- articles covering cosmology, galaxies, interstellar medium, stars, the solar system, space missions, theoretical concepts, and more. Subscription required. - Nature Encyclopedia of Life Sciences
- reference resource for the biological sciences. Subscription required. - Encyclopedia Britannica
- offers news, links, and access to abbreviated encyclopedia entries. - Encyclopedia.com
- provides more than 17,000 short articles from the Concise Columbia Electronic Encyclopaedia, Third Edition. - Information Please
- offering millions of useful and interesting facts on a wide range of topics. Also includes a dictionary and encyclopedia. - Encarta
- featuring abridged reference articles, a world atlas, quizzes, homework help, college prep, and more. - Wikipedia
- free, open content, community-built encyclopedia with thousands of articles on topics from A to Z. Available in dozens of languages. - Internet Encyclopedia of Philosophy
- listings of people and topics with definitions. - Columbia Encyclopedia, Sixth Edition
- complete contents of the year 2000 publication of the largest one-volume general encyclopedia available. Full-text searchable. - Stanford Encyclopedia of Philosophy
- contains a quarterly updated, refereed resource for philosophers. - Everything2
- aims to catalogue all human knowledge and show the interconnections between all the people, places, things, and ideas. - GuruNet
- develops and markets its GuruNet Answer Engine, which provides quick integrated reference answers instead of just search engine links. - EncycloZine
- hybrid portal/encyclopedia. - 1911 Encyclopedia Britannica
- features the entire 1911 edition online with 29 volumes and articles written by more than 1500 authors. - Canadian Encyclopedia Online, The
- searchable full-text version. Features articles, retrospectives, interactive maps, games, and more. - Web Directory: Encyberpedia
- Information website which links together encyclopaedias throughout the Internet. - Musical Heritage Network Instrument Encyclopedia
- search for the instrument of your choice or browse through the collection by the Sachs-Hornbostel classification scheme or by geographical origin. - Encyclopedia Smithsonian
- information about a variety of topics, from Smithsonian Institution sources. - Eric Weisstein's World of Science
 - comprehensive online encyclopaedias of astronomy, math, physics, scientific biographies, and scientific books, with many equations and formulas. - Internet Encyclopedia
- encyclopedia composed of information available on the Internet. - Disinfopedia
- free encyclopedia of propaganda. Collaborative project to produce a directory of public relations firms, think tanks, industry-funded organisations, and industry-friendly experts that work to influence public opinion and public policy on behalf of corporations, governments, and special interests. - Literary Encyclopedia
- features author biographies, text profiles, timelines, and glossary of literary terms. - JewishEncyclopedia.com
- features articles and pictures from the 1906 Jewish Encyclopedia. Topics include the Torah, history, literature, biography, geography, genealogy, and theology. - Yahoo! Reference
- provides dictionary, encyclopedia, quotation, and world fact resources. - Spartacus Encyclopedias
- including British history 1700-1950, and two separate works for World War I. - Household Cyclopedia, The
- collection of "10,000 receipts of use in all the arts of domestic and social life." Originally published 1881. - Probert Encyclopaedia
- reference resource containing entries addressing various life topics. - EOLSS: Encyclopedia of Life Support Systems
- integrated compendium of sixteen encyclopaedias. It attempts to forge pathways between disciplines in order to show their interdependence and helps foster the transdisciplinary aspects of the relationship between nature and human society. - Rudiments of Wisdom Encyclopaedia
- as drawn by cartoonist Tim Hunkin. A to Z index of thousands of illustrated topics and themes. - Platonic Realms
- math quotes, mini-texts and definitions. - Free Internet Encyclopedia
- includes macro and micro references. - Project Galactic Guide
- collaborative Internet attempt at creating an electronic reference meant to guide and misguide its readers in matters of life, death, and finding a parking space anywhere in the Universe, in the style of the Hitchhiker's Guide to the Galaxy. - h2g2
- official home of the Earth Edition of The Hitchhiker's Guide to the Galaxy. Offers an unconventional guide to life, the universe, and everything. - (AU) Encarta Australia
- offers a searchable encyclopedia, guides, articles, web links, and highlights. - Fixed Reference: Snapshots of Wikipedia
- offers periodic fixed snapshot copies of WikiPedia, without talk pages, allowing safe reference and linking. - Encyclopaedia of the Orient
- with photos and sound; specialises in North Africa and the Middle East. - BambooWeb Dictionary
- online dictionary and encyclopedia providing articles and information on a wide variety of topics. - Animal Ethics Clarifier
- encyclopedia of animal ethics. - Hutchinson Encyclopedia
- multimedia reference resource including articles, images, audio, video, atlas, quiz, quotations, dictionary, tables, and GCSE worksheets.
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