Encyclopædia Britannica it is scarcely used, and reviewers have recommended that it be dropped from the encyclopaedia. The also has color transparencies of human anatomy and several appendices listing the staff members, advisors, and contributors to all three parts of the Britannica. Taken together, the and comprise roughly 40 million words and 24,000 images. The two-volume index has 2,350 pages, listing the 228,274 topics covered in the "Britannica", together with 474,675 subentries under those topics. The "Britannica" generally prefers British spelling over American; for example, it uses "colour" (not "color"), "centre" (not "center"), and "encyclopaedia" (not "encyclopedia"). However, there are exceptions to
Compton's Encyclopedia in 2002. Britannica had sold its Compton's interests to the Tribune Company in 1993, and for a time "Compton's Encyclopedia" was a product of The Learning Company, which purchased Brøderbund in 1998. In March 2002 Encyclopædia Britannica, Inc. "acquired an exclusive license to publish and distribute "Compton's Encyclopedia" in print and CD-ROM from Broderbund LLC and Success Publishing Group". Britannica's 1989 "Compton's Multimedia Encyclopedia" was the first "multimedia" CD-ROM encyclopedia. It won the 1991 Software Publishers Association Excellence in Software Award for Best Education Program. Grolier's 1985 "Academic American Encyclopedia on CD-ROM" was text-only. In 1990, when it was called