my carried out in 6 and 8 months respectively, the evaluation of seismic data would require at least a year; evaluation of a high altitude detection shot would require even more time. The Commissioners then approved as revised a letter to Secretary Dulles. Note that around the beginning of 1959 there is a marked decrease in the frequency of discussinn of anything having to do with weapons developments, weapons testing, and to a certain extent the test ban discussions at Geneva, Meeting #1476, 24 February 59: Libby reported on a cable from the US Delegation at Geneva requesting guidance on answers to the latest Soviet proposals whith concerned the number of detonations for peaceful purposes to be permitted the two countries and reciprocal rights concerning inspections, The Commissioners agreed with Libby's proposed reply ''on inspection rights with respect to replacement parts foc weapons stockpile for peaceful burposes, '' Copies of these messages are in the files here, Meeting #1488, 20 March 59: Libby reported that Harold Brown, now at Livermore, had replied by message to Libbys' questions regarding control of a test ban on atraospheric tests, He felt Browns' proposal was a more practicable plan that currently being considered at Geneva and saidthe proposed plan involves ''approximately 14 control stations, perimatrical air inspection with no direct fly over, noreference toa "threshold" limit, and no provision for inspection teams," 95

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