1. Reconnoissance map of the United States showing the distribution of the geologic system so far as known Yale Public content 1893. 2010-08-04T13:32:28Z. 2020-06-13T21:32:38Z. McGee, W. J., 1853-1912. U.S. Geological Survey, Julius Bien & Co. Lith.). English. Public. United States.