00836cam a22002411 4500 gs 15000098 DLC 20260227111317.0 790417s1913 paubf s001 0 eng c gs 15000098 (OCoLC)4865669 U.S. Geol. Survey. Library NcRS NcRS DLC premarc n-us-pa GA61.P4 A5 no. 9 Brown, Amos P. (Amos Peaslee), 1864-1917. Minerals of Pennsylvania, by Amos P. Brown and Frederick Ehrenfeld. Harrisburg, Pa., W. S. Ray, 1913. 160 p. plates, maps (part fold.) 24 cm. Pennsylvania. Topographic and Geologic Survey. Report no. 9 Mines and mineral resources Pennsylvania. Ehrenfeld, Frederick, 1872-1940, joint author. 25470 25470