APA (7th ed.) Citation

Pearre, N. C., & Heyl, A. V. (1960). Chromite and other mineral deposits in serpentine rocks of the Piedmont Upland, Maryland, Pennsylvania and Delaware. United States Department of the Interior, Geological Survey.

Chicago Style (17th ed.) Citation

Pearre, Nancy C., and Allen V. Heyl. Chromite and Other Mineral Deposits in Serpentine Rocks of the Piedmont Upland, Maryland, Pennsylvania and Delaware. Washington, D.C.: United States Department of the Interior, Geological Survey, 1960.

MLA (9th ed.) Citation

Pearre, Nancy C., and Allen V. Heyl. Chromite and Other Mineral Deposits in Serpentine Rocks of the Piedmont Upland, Maryland, Pennsylvania and Delaware. United States Department of the Interior, Geological Survey, 1960.