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网站简介：Provides selected articles for free, full text with search capabilities, multimedia and related links for subscribers.
网站简介：On-Line dictionary, Internet encyclopedia, and almanac reference.
网站简介：Offers articles from the Columbia Encyclopedia and Britannica Concise Encyclopedia.
网站简介：Large searchable online dictionary and internet search engine for computer and internet terms and technical support. Definitions hyperlinked to further information.
网站简介：User-contributed online encyclopedia intended for people whose first language is not English.
网站简介：Glossary of terms. Material ranges from undergraduate to research level.
网站简介：A free encyclopedia built collaboratively using Wiki software. (GNU Free Documentation License)..
网站简介：Etexts, focusing on classics and general reference works.
网站简介：A link site that allows users to source information about films, famous trials, disasters, history and biography.
网站简介：Skeptical definitions and essays on occult, paranormal, supernatural and pseudoscientific ideas and practices.
网站简介：Contains the complete contents of the 1906 Jewish Encyclopedia. Over 15,000 articles and pictures about the Torah, history, literature, biography, geography, genealogy, and theology. Accessible for free and full-text searchable.
网站简介：The premier internet encyclopedia on mythology, folklore, and religion.
网站简介：Originally commissioned and peer reviewed articles across the life sciences. Online encyclopedia requires paid subscription.
网站简介：An encyclopedia of over 2500 symbols. Search by keywords/concepts or by graphical attributes.
网站简介：Reference for all military history - wars, individuals, battles, weapons and the concepts behind warfare.
网站简介：Offers articles from on the 11th edition Encyclopedia Britannica, and from the Crystal Reference Encyclopedia. All articles are searchable and alphabetized.
网站简介：Current knowledge of molecular and cellular biology in terms of the information pathways of interacting molecules or genes and links from the gene catalogs produced by genome sequencing projects.
网站简介：Encyclopedia of the occult, mysticism, and the paranormal.
网站简介：Online Repair Manuals for motorcycles, ATVs and scooters. Specification database for motorcycles, ATVs and scooters. Get the repair information you need now!
网站简介：Online version of the complete reference work along with dictionary, atlas, links, magazines, historical documents, audio, video, images, and 3D photographs. Requires free temporary registration with option to buy continued access for full articles.
网站简介：A Wikia encyclopedia to catalog the fictional Dune universe - or Duniverse - in one dedicated hierarchy.
网站简介：Articles on Anabaptist-related topics including history, theology, biography, institutions and local congregations.
网站简介：Open access encyclopaedia, based on Kluwer edition of 2002.
网站简介：The definitive source of information regarding the history of Cleveland, Ohio.