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Explorations and surveys for a rail road route from the Mississippi River to the Pacific Ocean; War Department; Route near the 35th parallel
Map no. 2, from the Rio Grande to the Pacific Ocean; from explorations and surveys made under the direction of the Hon. Jefferson Davis, Secretary of War
by Lieut. A. W. Whipple, Topogl. Engrs. and Lieut. J. C. Ives, Topogl. Engrs., 1853-4.
Originally published in Pacific Railroad Reports, quarto edition, Volume XI (33rd Cong., 2nd Sess., Senate Ex. Doc. Number 78, Serial 768; House Ex.Doc. Number 91, Serial 801).
Cited in Carl I. Wheat's Mapping the Transmississippi West, 1540-1861; volume 4, number 875.
"D-3. Lieutenant Whipple's expedition was the third of a series of five such Railroad surveys conducted. It was proposed so as to command the widest possible base of Southern allegiance and still offer certain advantage to the North Central groups."
Insets: "Sketch of Aztec Pass," drawn by C. Mahon from a sketch by A. H. Campbell, Civil Engineer," 1:120,000.--"Sketch of Campbell's Pass from Agua Azul to Salt Spring," drawn by C. Mahon, 1:240,000."