A member of Clarence King's Geological Exploration of the 40th Parallel is surveying from a rock. Shoshone Canyon and Falls, Idaho Terr., in background. By O'Sullivan, 1868.

243k

Timothy O'Sullivan's ambulance wagon and portable darkroom used during the King Survey rolls across the sand dunes of Carson Desert, Nev. By O'Sullivan, 1867.

130k

A noon meal in Ferdinand V. Hayden's camp of the U.& Geological Survey. Red Buttes, Wyo. Terr., August 24, 1870. Hayden sits at far end of table in dark jacket; W. H. Jackson stands at far right. By Jackson.

263k

The U.S. Geological and Geophysical Survey of the Territories, conducted by Hayden, en route with pack train upon the trail between the Yellowstone and East Fork Rivers "showing the manner in which all parties traverse these wilds." Wyo. Terr. By Jackson, 1871.

280k

First camp of the John Wesley Powell expedition, in the willows, Green River, Wyo. Terr. By E. 0. Beaman, 1871.

254k

An overland caravan laden with boats. Robert B. Stanton's Denver, Colorado Canyon, and Pacific Railway Survey, 1889-90.

268k

"Rebuilding Monument 40." By D. H. Payne, under the direction of the U.S. section of the International Boundary Commission, along the Mexican border west of the Rio Grande, 1892--94.

271k

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