Delanglez, Jean; McMahon, Thomas J. [editor]. El Rio Del Espiritu Santo: An Essay on the Cartography of the Gulf Coast and the Adjacent Territory during the Sixteenth and Seventeenth Centuries; United States Catholic Society Monograph Series XXI. New York: The United States Catholic Historical Society, 1945. 
Green cloth, former Catholic college library copy with typical library additions, 6 x 9 inches, xiii., 182 clean pp., tight. Illustrated with several plates of maps. Good. Hardcover.
Includes a ten-page list of maps consulted beginning with year 1502 and ending 1718.
"In the present essay, relying on the numerous maps of the interior of the United States between the Appalachian Range and the Rocky Mountains, we shall inquire what knowledge the best informed geographers of the period seemed to have had of the Mississippi, and in particular, whether the river which is labeled 'Rio del Espiritu Santo' on these maps is the Mississippi itself." - Introduction.