WT-1609 (EX) EXTRACTED VERSION OPERATION HARDTACK April-OQctober 1958 411002 Project 1.4 Physical Characteristics of Craters From Near-Surface Nuclear Detonations Headquarters Field Command Defense Atomic Support Agency Sandia Base, Albuquerque, New Mexico May 10, 1960 NOTICE This is an extract of WT-1609, which remains classified SECRET/FORMERLY RESTRICTED DATA as of this date. Extract version prepared for: Director Approved for public release; distribution unlimited. DEFENSE NUCLEAR AGENCY Washington, D. C. 20305 31 October 1984 BEST COPY AVAILABLE