Hagner, Arthur Feodor 1911- creator text bibliography wyu Laramie University of Wyoming 1944 monographic eng

print

47 p. illus. by Arthur F. Hagner. "References": p. 45-47. Vermiculite Mines and mineral resources Wyoming QE181 .A25 no. 34 gs 44000033 DLC 790609 20260227111349.0 gs 44000033