United States. Office of Indian Affairs. St. Louis Superintendency

On April 10, 1833, scientist-naturalist Prince Maximilian of Wied, accompanied by the artist, Karl Bodmer, and personal servant, David Dreidoppel, who was an experienced hunter and taxidermist, set out from St. Louis aboard the American Fur Company steamer Yellow Stone on a thirteen-month natural science expedition up the Missouri River.

From the description of William Clark, superintendent of Indian affairs, to all whom it may concern : under authority vested in me by the president of the United States to grant permission to citizens or other persons to pass into and through the Indian county, &c., permission is hereby granted to M. Baron Braunsberg to pass through the Indian country by the Missouri River to the Rocky Mountains for the purpose of making observations in zoology and botany ... and to take with him Charles [i.e. Karl] Bodmer and David Dreydopple [i.e. Dreidoppel] ... : passport, 1833 Apr. 2. (Newberry Library). WorldCat record id: 40455925