The collection consists of four folders that largely contain photographs, letters, drawings, and manuscripts. This material served as actual or potential illustrations for Hebard's research on Sacajawea and the Lewis and Clark Expedition, which she conducted for her book Sacajawea: Guide of the Lewis and Clark Expedition, which was published in 1933. Folder 1 contains material that was not used as illustration. Folder 2 is the typed manuscript, including a bibliography and corrections. Folder 3 consists of copies while Folder 4 contains the respective originals. For the most part, these illustrations were used in the book.