The main body is arranged by author with a title index. Periodicals indexed are of a broad, popular, and general nature. Cumulative index to book reviews from 1905-1975. A bit confusing to use at first, this source can be useful, especially as a short cut to Book Review Digest. Titles and authors are in separate volumes.
Many book reviews appear in newspapers.
Although some of the sources above index newspapers, most major newspapers have their own indexes. Indexes New York Times, Boston Globe, Wall St. Journal, Christian Science Monitor, Washington Post, Los Angeles Times, Atlanta Constitution, and Chicago Tribune. Indexes book reviews appearing in the New York Times 1896-1970. Subject area indexes may afford longer or more specialized reviews, or cover titles not reviewed in the general indexes.