Minerals of Pennsylvania,
Brown, Amos P. 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 .
gs 15000098
Mines and mineral resources--Pennsylvania.
GA61.P4 / A5 no. 9
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 .
gs 15000098
Mines and mineral resources--Pennsylvania.
GA61.P4 / A5 no. 9