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This collection consists of extensive aerial photographs documenting western South Dakota, with particular focus on the Black Hills region. The images span various dates and locations, including Meade and Pennington counties, and were taken primarily during the summer and fall months. Many of the photographs were created by the U.S. Army Corps of Engineers and the U.S. Department of Agriculture, some as part of efforts to monitor environmental conditions such as mountain pine beetle infestations.

The collection includes individual and sequential image sets identified by flight lines, roll numbers, and dates. Several groups of photographs are infrared and color aerials, some annotated or indexed, and are organized by geographic location or agency designation. Accompanying materials include photographic indexes, flight maps, USDA parameters, and some duplicate negatives.

The collection consists of correspondence between Henry Langford Loucks and Richard F. Pettigrew from 1914 to 1916, primarily discussing political issues related to the progressive movement in early 20th-century America. Loucks' letters to Pettigrew span from November 1914 through July 1916, while Pettigrew's responses cover a similar period. In addition to the correspondence, the collection includes undated photographs, editorials authored by Loucks, and a 1917 pamphlet titled Will the Farmer be the "Goat" Once More?, which addresses agricultural and economic concerns. The materials provide insight into the political discourse and reform efforts of the time.