As suggested by the subtitle, this volume is the second edition of a massive bibliography on Pennsylvania history published under the auspices of the Pennsylvania Historical and Museum Commission. The second edition, like its predecessor published in 1946, was compiled by Norman Wilkinson, an Assistant State Historian in the Historical Division of the Commission. Designed as a research tool and guide for librarians, teachers, researchers, and writers in the field of Pennsylvania history, the Bibliography of Pennsylvania History must be regarded as the premier sourcebook on its topic for all printed sources published before 1952. Virtually all writings on Pennsylvania's past, from prehistoric times to 1952, are covered, as witnessed by the following types of materials listed in the compilation: printed books and serials; biographies; autobiographical writings; monographic publications; printed and unprinted doctoral dissertations; publications of regional, county, and local historical societies; general and topical works not limited to but bearing on Pennsylvania; textbooks; pamphlets, brochures, and printed addresses; and folklore, legends, poetry, and plays set in Pennsylvania. Finding an item of interest is straightforward as the more than 9,000 entries are arranged topically and thereunder by author in the volume's detailed table of contents. Works may also be found in the extensive index to authors and subjects. Clearfield Company is proud to make this comprehensive, partially annotated bibliography on Pennsylvania history available to genealogists, historians, and others who wish to know more about its storied past.