Subseries contains research materials compiled by Stan Gibson including articles, excerpts, notes, etc. Most material is related to the Baker Massacre, or indigenous history/culture of the Great Plains.

Series contains Stan Gibson's correspondence regarding various research leads, interests, materials, etc. related to the Marias River Massacre.

Series contains manuscripts of various works by Stan Gibson, as well as related materials such as revision notes, outlines, chronologies, etc.

Contains biographical information and other materials regarding various significant individuals related to the 1870 Marias River Massacre.

Subseries contains materials on various subjects related to the 1870 Baker Massacre. Files may include articles, excerpts, correspondence, notes, references/bibliographies, etc.