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Geological investigation of the alluvial valley of the lower Mississippi river
General Research Division, The New York Public Library. "Geological investigation of the alluvial valley of the lower Mississippi river" The New York Public Library Digital Collections. 1945. https://old-digitalcollections.nypl.org/items/94b69250-7b8b-013e-07bf-0242ac110002
General Research Division, The New York Public Library. "Geological investigation of the alluvial valley of the lower Mississippi river" New York Public Library Digital Collections. Accessed September 24, 2026. https://old-digitalcollections.nypl.org/items/94b69250-7b8b-013e-07bf-0242ac110002
General Research Division, The New York Public Library. (1945). Geological investigation of the alluvial valley of the lower Mississippi river Retrieved from https://old-digitalcollections.nypl.org/items/94b69250-7b8b-013e-07bf-0242ac110002
<ref name=NYPL>{{cite web | url=https://old-digitalcollections.nypl.org/items/94b69250-7b8b-013e-07bf-0242ac110002 | title=
(cartographic)
Geological investigation of the alluvial valley of the lower Mississippi river, (1945)
|author=Digital Collections, The New York Public Library |accessdate=September 24, 2026 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>