Collier's Encyclopedia

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Collier's Encyclopedia was a U.S.-based general encyclopedia. It was first published in 20 volumes in 1950-51 and in 1962 was expanded to 24 volumes. It was long considered one of the three major contemporary English-language general encyclopedias, together with Encyclopedia Americana and Encyclopædia Britannica—the three were sometimes collectively called "the ABCs".

The 1997 edition had 23,000 entries. There are not many short entries, as related subjects are usually consolidated in longer articles. A high percentage of the illustrations are in color. Bibliographies are found in the last volume rather than at the end of articles. The last volume also contains the essential index with 450,000 entries (1997 edition). A CD-ROM version was first published in 1996. An annual Collier's Year Book was also published.

In 1998 Microsoft bought copyrights to Collier's electronic version and incorporated them into its Encarta electronic encyclopedia. Atlas Editions (formerly Collier Newfield) retained the rights to publish the encyclopedia in book form, though since then, Collier's has ceased to be in print.es:Enciclopedia Collier