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person:(Roberts, D.)

    Mission Requirements for Exobiological Measurements on Venus

    Riesen, W. H. / Roberts, D. L. | NTRS | 1966

    Missions to the comets.

    Friedlander, A. L. / Roberts, D. L. | NTRS | 1969

    Radar exploration of Venus

    Goldman, H. L. / Roberts, D. L. | NTRS | 1970

    Criteria for lunar site selection

    Binder, A. B. / Roberts, D. L. | NTRS | 1970