Critical mass

"The previously secret--now declassified--unpublished military, governmental, intelligence and Department of Energy documentation cited throughout 'Critical Mass' suggests the atomic bomb was not fully developed and built by American scientists and technicians, as traditional, long-standing history asserts. Instead, the evidence shows enriched uranium and other atomic bomb components developed by Nazi Germany were surrendered to United States forces during the final weeks of the war--probably according to prearranged surreptitious agreements--and were a vital part of the materials used to create the bombs that were dropped on Hiroshima and Nagasaki."--Introduction.