Astrogeological studies, annual progress report, July 1, 1965, to July 1, 1966

This Annual Report is the seventh of a series describing the results of research conducted by the U.S. Geological Survey on behalf of the National Aeronautics and Space Administration. The report is in four volumes corresponding to four main areas of research: Part A, Lunar and Planetary Investigations (with a map supplement); Part B, Crater Investigations; Part C, Cosmic Chemistry and Petrology; and Part D, Space Flight Investigations. An additional volume presents abstracts of the papers in Parts A, B, C, and D.