This annotated bibliography is the first to cover the early phases of the Korean War, for the period from June 25 to September 22, 1950, in a comprehensive manner. This guide provides a brief history of the critial period around the Pusan perimeter, identifies important archival sources, and then describes 401 studies in English—both offical and unofficial reports, documents, surveys, monographs, and periodical articles. The bibliography is organized both by different genres of work and topically. An appendix points to the United Nations country's forces that served in the war. Indexes by author, subject, and periodical make this short guide easy for researchers in all fields of study.