This volume contains about 600 entries on various aspects of the history of science, including individuals (e.g., Galileo), disciplines (e.g., astronomy), and broad topics (e.g., religion). Written by an outstanding group of over 200 international scholars, the entries focus on secondary sources and are geared to the nonspecialist. Each entry provides a short bibliography followed by a short essay on the topic, discussing the various merits of the titles listed. In 1952, George Sarton, the "father" of the study of the history of science, prepared a detailed bibliography, A Guide to the History of Science (Chronica Botanica). Many others have followed, including the nonannotated ISIS bibliographies (published by the History of Science Society), but almost all of these are highly technical in nature. In addition to this work, academic libraries should look at Helaine Selin's The Encyclopedia of the History of Science, Technology and Medicine in Non-Western Cultures (Kluwer, 1997) as a counterbalance to the Reader's Guide's more Western orientation. This current volume is not only an excellent resource for public and academic libraries but a very good deal for the price. Highly recommended.