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See below for more on this database. Available to SUNY Potsdam users only. A Directory of Book Review sources on the web - a large list of other internet sites providing book reviews Book Review Sources in Crumb Library Book reviews appear at the time a book is first published. Criticism of that book may continue to be written for years to come, especially if the work is still seen as important. The most common way of finding a book review is to use an index to the reviews that have appeared in periodicals.