The minerals of Pennsylvania: Iron ores of Pennsylvania,
Hickok, William Orville, 1905-
The minerals of Pennsylvania: Iron ores of Pennsylvania, by William O. Hickok, IV. - Harrisburg, Pa., Department of Internal Affairs, Topographic and Geologic Survey, 1939. - 21 p. incl. tables. 23 cm. - Bulletin M, 18-B .
At head of title: Pennsylvania Geological survey, Fourth series With Ashley, G. H. The undeveloped mineral resources of Pennsylvania. 1933. (Bulletin M18-A)
Bibliographical footnotes.
gs 40000142
Iron ores--Pennsylvania.
TN24.P4 / A7
The minerals of Pennsylvania: Iron ores of Pennsylvania, by William O. Hickok, IV. - Harrisburg, Pa., Department of Internal Affairs, Topographic and Geologic Survey, 1939. - 21 p. incl. tables. 23 cm. - Bulletin M, 18-B .
At head of title: Pennsylvania Geological survey, Fourth series With Ashley, G. H. The undeveloped mineral resources of Pennsylvania. 1933. (Bulletin M18-A)
Bibliographical footnotes.
gs 40000142
Iron ores--Pennsylvania.
TN24.P4 / A7