Mauck Brammer was a Helena, Montana, resident and amateur archaeologist and historian. This collection includes writings, correspondence, subject files, and research notes on Clancy, Montana City, the Prickly Pear Valley area, the MacHaffie archaeological site, and mining.

Henry Clark was one of the founders of East Helena, Montana. This collection consists of outgoing correspondence (1864-1895) of Clark and other members of his family to his relatives in Iowa, including extensive comments on frontier and pioneer life in Virginia City and Helena, Montana Territory.