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Science  07 Jul 1972:
Vol. 177, Issue 4043, pp. 52-56
DOI: 10.1126/science.177.4043.52

Article Information

vol. 177 no. 4043 52-56

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    Author Information

    1. Carl Sagan1,
    2. George Mullen1
    1. 1Laboratory for Planetary Studies, Cornell University, Ithaca, New York

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