[Upper Rio Negro and Casiquiare Canal, Venezuela].

Chicago citation style
[Upper Rio Negro and Casiquiare Canal, Venezuela].. 1920. Retrieved from the Digital Public Library of America, http://collections.lib.uwm.edu/cdm/ref/collection/agdm/id/2157. (Accessed December 9, 2019.)
APA citation style
(1920) [Upper Rio Negro and Casiquiare Canal, Venezuela].. Retrieved from the Digital Public Library of America, http://collections.lib.uwm.edu/cdm/ref/collection/agdm/id/2157
MLA citation style
Retrieved from the Digital Public Library of America <http://collections.lib.uwm.edu/cdm/ref/collection/agdm/id/2157>.
Note: These citations are programmatically generated and may be incomplete.