U.S. National Commission for UNESCO memo, special issue: [Man and his environment, view toward survival, 13th National Conference of United States National Commission for UNESCO Nov. 23-25, 1969, San Francisco, Calif.]
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U.S. National Commission for UNESCO memo, special issue: [Man and his environment, view toward survival, 13th National Conference of United States National Commission for UNESCO Nov. 23-25, 1969, San Francisco, Calif.]
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U.S. National Commission for UNESCO memo, special issue: [Man and his environment, view toward survival, 13th National Conference of United States National Commission for UNESCO Nov. 23-25, 1969, San Francisco, Calif.]