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
Encyclopædia Britannica and recency. In all four categories and for all three encyclopaedias, the four average grades fell between B− and B+, chiefly because none of the encyclopaedias had an article on sexual harassment in 1994. In the accuracy category, the "Britannica" received one "D" and seven "A"s, "Encyclopedia Americana" received eight "A"s, and "Collier's" received one "D" and seven "A"s; thus, "Britannica" received an average score of 92% for accuracy to "Americana"s 95% and "Collier's" 92%. In the timeliness category, "Britannica" averaged an 86% to "Americana"'s 90% and "Collier's" 85%. The most notable competitor of the "Britannica" among CD/DVD-ROM digital encyclopaedias