found: Author's A tabulation of lead isotopic ratios for lead minerals from mines and prospects in the Belt-Purcell Basin in the U.S. and Canada, 1984:t.p. (R.F. Marvin, U.S. Geological Survey)
found: Kellogg, K.S. New potassium-argon ages, geochemistry, and ... 1988:CIP t.p. (Richard F. Marvin)
found: LC data base, 8-27-87(hdg.: Marvin, Richard F.; usage: Richard F. Marvin)
found: Marquis who's who WWW site, Jan. 26, 2016(Richard Frederick Marvin; born May 1, 1926, Bozeman, Mont.; Geologist, U.S. Geological Survey, Washington and Denver, 1952-87)