The mineral industry of Pennsylvania in 1970.
Contributors: United States. Bureau of Mines.
Series: Information circular 73; Information circular (Pennsylvania. Bureau of Topographic and Geologic Survey) -- no. 73..
Publisher: Commonwealth of Pennsylvania, Bureau of Topographic and Geologic Survey
Published: 1972
Place of publication: [Harrisburg]
Language: eng
Number of pages: 35
Subjects: Coal mines and mining -- Pennsylvania.
Notes: Preprint from the 1970 Bureau of Mines Minerals Yearbook.