OFFICIAL USE UNLY OFFICIALUSE ONLY NEW STANDARD FORM FOR ANNOUNCEMENT OF TESTS IN HARDTACK SERIES A nuclear test detonation took place at 00 hours, QO minutes, 00.0 seconds, a.m, (date), 1958, Eniwetok time (here insert equivalent time and date E.T,D.) at the Bikini Atoll, or Johnston Island), (Eniwetok or {here insert in parenthesis latitude and longitude to the nearest second). The detonation, which took piace (on an atoll, ona barge, in the air) had a yield in the (megaton or kiloton) range. The purpose of the test was the development of (e.g., a defense against missiles or weapons with reduced fallout or military effect). The detonation was part of the HARDTACK nuclear weapons test series underway at the Eniwetok Proving Ground. (Certain of these data are given as matters of general scientific interest, especially to those concerned with International Geophysical Year projects. Specifically, the shock can be used to study the earth's internal structure. Seismologists are urged to submit thelr findings to the U.S, Coast and Geodetic Survey which is the official government agency for compilation of such information.) OFFICIAL USE ONILY

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