John W. Powell (1834-1902), American soldier, professor, explorer and the second director of United States Geological Survey. Photograph taken between 1881 and 1894 by an unknown photographer. | Source: This image is available from the United States Library of Congress's Prints and Photographs division under the digital ID cph.3a07308.Download Original File
Source
This image is available from the United States Library of Congress's Prints and Photographs division under the digital ID cph.3a07308.
