Encyclopedia Britannica

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First published in Scotland as a three-volume set in the 1770s, Encyclopaedia Britannica first came to the U.S. as a pirated edition. By the time the encyclopedia was in its 14th edition in 1929, its operations had moved to the U.S. permanently. Today the Encyclopedia Britannica is published as a 32-volume set, as well as in CD-ROM form. The traditional hardback edition sells for more than $1,200 per set.