Early Survey Map of the Pike's Peak Area of Colorado
"Sketch showing the Primary and Secondary Triangulation of 1873"
Engraved map, 1873, compiled on the Ferdinand Hayden survey expedition, working for the Department of the Interior in Colorado, Nebraska and north to Wyoming and Montana (which led to the creation of Yellowstone National Park), this map showing in fascinating, and finely drawn detail the working methods of mapping new land through triangulation, with vertical and horizontal folds as issued (now flattened), on cream-colored paper; some toning along folds, one small area of paper loss at a fold join and a few very short tears in the margins, all restored with archival tape on the reverse, but otherwise in very good condition
Sheet 24 x 18 1/4 inches
$275
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