Map of the Valley of the Amazon to accompany Lt. Herndon's report [showing both Herndon's and Gibbon's routes] /
Herndon, William Lewis.
Elliott, H. C.(Henry C.)
Gibbon, Lardner.
A. Hoen & Co.
[Washington, D.C.,
1854]
In: Exploration of the Valley of the Amazon. By W.L. Herndon. Vol. 1.
Vertical section of route from Callao to Pará.