MGP's Research Library holds over 25,000 volumes and monographs specializing in the prehistory, natural history, and regional history of the Great Plains. Numerous books written by county historical societies inject a local flavor to the library. The non-circulating materials can be used Tuesday and Thursday by appointment. MGP's Photographic Collection includes over 80,000 images donated from area residents, local photographic studios, the Lawton Constitution, and other early newspapers. Images include early settlement of the Southwest, North American Indian culture, local military involvement, wildlife and outdoor scenes, and daily family life in rural and urban Oklahoma and Texas.
Prints are available for personal use, publications, and exhibitions.