Cite

Geological chart of the United States, east of the Rocky Mountains, and of Canada / compiled by Frank H. Bradley, Prof. Geol., East Tennessee University.

MLA

Geological Chart of the United States, East of the Rocky Mountains, and of Canada / Compiled by Frank H. Bradley, Prof. Geol., East Tennessee University. 1875. https://collections.library.yale.edu/catalog/15603790.

APA, 6th edition

Geological chart of the United States, east of the Rocky Mountains, and of Canada / compiled by Frank H. Bradley, Prof. Geol., East Tennessee University. (1875). [Maps]. https://collections.library.yale.edu/catalog/15603790.