The MicroReference contains short bits of information and references to specific subjects, sometimes with instructions on finding the specific subject inside a general reference. Grup Enciclopedia Catalana - founded in Barcelona in 1965, for the purpose of publishing great reference works. Consists of 15 volumes with the collaboration of more than 2,000 specialists. Sign up to be a writer or an editor. The Probert Encyclopaedia - Serious reference source with over 60,000 fully hypertext linked entries covering the entire spectrum of human knowledge.
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