Timothy O’Sullivan (1840-1882)? États-Unis, 1871-1874.? War Department. Corps of engineers. US Army.? Geographical Explorations and Survey. West of the 100th Meridian.? Canyon of the Colorado River. Black Canyon Colorado River from Camp 8 looking above. Cooley’s Park. Sierra Blanca Range, Arizona. Shoshone Falls, Snake River, Idaho.? Cinq (5) épreuves sur papier albuminé contrecollées sur cartons du Corps of Engineers. Légendes tapuscrites et mention du photographe sur les montages. ? Format moyen : 20 x 27 cm