Historical statistics of Pennsylvania's mineral industries, 1966-1970
By: [by] John D. Ridge [and] John H. DeYoung, Jr.
Contributors: DeYoung, John H., joint author.
Series: Mineral conservation series; Bulletin of the Earth and Mineral Sciences Experiment Station, no. 87
Publisher: College of Earth and Mineral Sciences, Pennsylvania State University
Published: 1972
Place of publication: University Park
Language: eng
Number of pages: 76
Subjects: Mines and mineral resources -- Pennsylvania -- Statistics.