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WASHINGTON, D.C.
Meeting 472
Cosmos Club
Wednesday, January 28, 1931
Oscar Edward Meinzer, President Arthur Maine Piper, Meeting Secretary
Clarence Samuel Ross—USGS—The Valles Mountain volcanic crater, New Mexico.
Adolph Knopf—Yale University—The Engels copper district, California.
Attendance: 92
Minutes not available.
Published account of meeting appears in: J. Wash. Acad. Sci. 21, 178-182