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| | Explanatory Text for the Geologic Map of the U.S. - Part 4 |
 | | Hall, James, and Lesley, J. P., 1857, Map illustrating the general geological features of the country west of the Mississippi River, in Emory, W. H., Report of the United States and Mexican Boundary Survey: U.S. 34th Cong., 1st Sess., Senate Ex. |
 | | Marcou, Jules, 1855, Résumé explicatif d'une carte géologique des États-Unis et des provinces anglais de l'Amérique du Nord: Soc. |
 | | Marcou, Jules, and Marcou, J. B., 1884, Mapoteca geologica Americana; a catalogue of geological maps of America (North and South), 1752-1881: U.S. Geol. |
| pubs.usgs.gov /dds/dds11/pp901_html/4_PP901.HTML (1697 words) |
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