by ROBERT O'BRIEN.
by PHILIP D THOMPSON.
by PETER FARB.
by MAITLAND A EDEY.
by JOHN ROWAN WILSON.
by H GUYFORD STEVER.
by EDWARD V LEWIS.
by CARL SAGAN.
by C C FURNAS.
by ARTHUR C CLARKE.
by SAMUEL A GOUDSMIT,ROBERT CLAIBORN.
by LUNA B LEOPOLD,KENETH S DAVIS.
by MODEL & LANAING.
by HERMAN F MARK.
by HENRY MARGENAU.
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