David Leveson and C. E. Nehru, “Maps, Contours, Profiles, and Gradients,” Brooklyn College –Earth and Environmental Sciences (academic.brooklyn.cuny.edu/geology/grocha/mapcontour/ : accessed 30 January 2026).
United States Geological Survey, Topographic Map: Santa Fe, New Mexico Quadrangle, 30-minute series (1894); image, USGS, topoView (ngmdb.usgs.gov/ht-bin/tv_browse.pl?id=5de8d8c1c82dc5a1d2e4665cec8655dd : accessed 30 January 2026).
Laredo, Webb County, Texas, Insurance Maps (New York: Sanborn-Perris Map Co., 1905), Map 11; image, Library of Congress (loc.gov/item/sanborn08614_005/ : accessed 30 January 2026), image 11.
Historic American Buildings Survey, Paul Prevost Bertani House, 604 Iturbide Street, Laredo, Webb County, TX, 1974; image, Library of Congress (loc.gov/item/tx0293/ : accessed 30 January 2026).