This book contains th~ Proceedings of the World Conference of the International Nuclear Target Development Society held in Boston, October 1-3, 1979. Approximately seventy participants and registrants from the following countries attended this Conference: Belgium, Canada, Denmark, United Kingdom, German Federal Republic, Israel, Japan, The Netherlands, Saudi Arabia, Switzerland, and the United States. The Conference was sponsored by the New England Nuclear Corporation. Conference Chairman in residence was Jozef Jaklovsky who was assisted by the invited Co-Chairman D. Riel of the State University of New York at Stony Brook. This publication incorporates the proceedings of an inter­ national conference concentrating on the general field of target preparation for use with particle accelerators. The publication includes additional contributions on target preparations by honorary members of this Society. For the first time in this field, an extensive bibliography collection (1936-June 1980) is included. Bibliography, subject index, author index, country index, and patent index have been organized by the editor. The biblioqraphy includes thin and thick particle accelerator targets and also preparation and use of targets in particle accelerators.