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WASHINGTON, D.C.
Meeting 477
Cosmos Club
Wednesday, April 8, 1931
Oscar Edward Meinzer, President Arthur Maine Piper, Meeting Secretary
John Calvin Reed and James Gilluly—USGS—Heavy mineral assemblages in some plutonic rocks of eastern Oregon.
Arthur Maine Piper—USGS—Observations in the Dalles region, Oregon, bearing on the history of Columbia River.
Roger Clark Wells—USGS—Van't Hoft's studies of minerals deposited from sea water.
Attendance: 57
Minutes not available.
Published account of meeting appears in: J. Wash. Acad. Sci. 21, 365-372