nber series on long-term factors in economic development Heroes & cowards : the social face of war / Dora L. Costa & Matthew E. Kahn Atomic energy for military purposes : the official report on the development of the atomic bomb under the auspices of the United States Government, 1940-1945 … memorandum center of international studies princeton university Is the American defense effort enough? / by Klaus Knorr American scientists and nuclear weapons policy / by Robert Gilpin