Geology in 1899

A Report of the Geological Exploration of the Fortieth Parallel, Made by Order of the Secretary of War According to Acts of Congress of March 2, 1867 by United States Geological Exploration of

Report of the Exploring Expedition from Santa Fe, New Mexico, to the Junction of the Grand and Green Rivers of the Great Colorado of the West, in 1859 by United States Army Corps of Engineers

Manual of Mineralogy ... by Dana, J. D.

Report of Progress in the Venango County District. by John F. Carll. Observations on the Geology Around Warren. by F. A. Randall. by Carll, John Franklin

The Geology of Tennessee by Safford, James Merrill