Schomburgk;Robert H. Sketch Map of British Guiana. Map. London: John Arrowsmith;1840. Accessed March 3;2023. https://www.loc.gov/resource/gdcwdl.wdl_11335/?r=-1.396;0;3.793;1.757;0.

Schomburgk;Robert H. Sketch Map of British Guiana. Map. London: John Arrowsmith;1840. Accessed March 3;2023. https://www.loc.gov/resource/gdcwdl.wdl_11335/?r=-1.396;0;3.793;1.757;0.