00923cam a22002651 4500 gs 55000283 DLC 20260227111403.0 860228s1955 dcub b 000 0 eng c gs 55000283 (OCoLC)13210014 U.S. Geol. Survey. Libr. TxHR OrAshS DLC premarc QE75 .C5 no. 362 TN805.O7 M3 Copy 2. I 19.4/2:362 Mason, Ralph S. Coal resources of Oregon, by Ralph S. Mason and Margaret I. Erwin. Prepared in cooperation with the Oregon Dept. of Geology and Mineral Industries. Washington, 1955. ii, 7 p. maps (part fold.) 27 cm. United States. Geological Survey. Circular 362 Bibliography: p. 6-7. Coal mines and mining Oregon. Erwin, Margaret Isabelle, 1922- joint author. 28990 28990