This collection consists of photographs, correspondence, and other papers of Sarah Goodspeed, a white Christian missionary for the Woman's American Baptist Home Mission Society (WABHMS), documenting her work on the Crow Indian Reservation in Pryor, Montana, in the 1910s. Materials include a linguistic journal, eighty photographs, handwritten poetry and notes, several letters and postcards, and printed and typescript articles and essays.

The linguistic journal contains twenty-four pages of Goodspeed's documentation of various Apsáalooke (Crow) phrases and their English translations. Three letters and from Goodspeed to her parents detail her daily routine and discuss the poor treatment of Crow people by white government agents, maintenance of the missionary buildings, church services, and school attendance figures, as well as deaths, baptisms, and other events in the community. Also present are a fundraising letter, postcards, nearly forty pages of poetry and lecture notes, cancelled checks, and handwritten cards describing Crow cultural objects (not present) and their provenance. There is also a group of printed and typescript articles and essays, by both Crow and missionary authors, which appear to have been published in local newspapers or in newsletters sent to missionary organizations. These include a handbill titled "Indians Baptized at the Crow Indian Reservation," printed accounts of John White Man Runs Him (Spies on the Enemy Strong) and Chief Bell-Rock and his grandson James Buster Bell Rock, an unattributed story titled "Bull Snake," and other articles and essays relating to wedding news and other events.

The collection also includes extensive photographic documentation of the Crow Reservation, including eighty annotated photographs, mostly picturing Crow people. Subjects are often identified by name, with annotations mentioning Mrs. Stronglefthand, Plenty Crow, Myrtle Wood Lick, Sarah Male Bear, Alexander Hair Feather and his wife, The Corn Woman, The Turnsback Plenty Family, Bull Snake, Ten Bear, Lucy Turns Back Plenty, Ralph Turns Back Plenty, Coyote That Runs, Dora Travels Well Known and her baby, Gibson Male Bear, Mrs. Medicine Rock, Guy Bull Tail, Ten Bears and his wife, and numerous others. According to Goodspeed's notations, two of the subjects, Dora Yellow Face and Among the Willows died in the first year after she arrived at Pryor; a third, Theodore White Mouth, died sometime during her service. Many of the photographs picture children, and some show Crow people and Baptist missionaries together at events such as Sunday dinners, picnics, and the baptism of Old Corn Woman. Identified locations in the photographs include the Pryor General Store and Post Office, Pryor Pass, various houses belonging to the missionaries, the school, the mission, the Bowler Post Office ("about 25 miles from Pryor"), the Custer Battlefield Memorial, and the chapel. Goodspeed may have also spent some time as a missionary or passed through the White Earth Reservation in northwestern Minnesota, as three photographs also depict Ojibwa (Ojibwe, Chippewa) people.