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2. Moore, H. J. and Zisk, S. H.: 1973, ?Calibration of Radar Data from Apollo 17 and Other Mission Results?, submitted forApollo 17 Preliminary Science Report, NASA; to be published.
3. Pettengill, G. H. and Thompson, T. W.: 1968,Icarus 8, 457?471.
4. Pettengill, G. H., Zisk, S. H., Thompson, T. W.: 1973,The Moon, this issue, p. 3.
5. Pieters, C., McCord, T. B., Zisk, S. H., and Adams, J. B.: ?Lunar Black Spots and the Nature of the Apollo 17 Landing Area?,J. Geophys. Res., to be published.