Grolier was one of the largest U.S. publishers of general encyclopedias, including The Book of Knowledge (1910), The New Book of Knowledge (1966), The New Book of Popular Science (1972), Encyclopedia Americana (1945), Academic American Encyclopedia (1980), and numerous incarnations of a CD-ROM encyclopedia (1986–2003).
Grolier was an educational publishing company known for its presence in school libraries. It had a strong presence among the under-six demographic, the target of Grolier's direct mail-to-the-home business.
Grolier became part of Scholastic Corporation in June 2000, which maintains Grolier Online.
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