South America: "Map of the River Pilcomayo from paralel 22o S. to the River Paraguay in seven sheets, by Gunnar Lange, M. Am. Soc. C. E., and sketch of the Route traversed by the land convoy based on approximate data", 1906

South America: "Map of the River Pilcomayo from paralel 22o S. to the River Paraguay in seven sheets, by Gunnar Lange, M. Am. Soc. C. E., and sketch of the Route traversed by the land convoy based on approximate data", 1906, Drawer: Flat Files RB-001, Folder: 39. Map Collection of the Booth Family Center for Special Collections, GRB-20211220. Georgetown University Rare Books , Booth Family Center for Special Collections. https://findingaids.library.georgetown.edu/repositories/14/archival_objects/1451603 Accessed November 18, 2024.