This collection contains materials from the Montana Department of Environmental Quality (1908-2012). This collection has been intellectually integrated into one Record Group, RS 494, to help facilitate access and reduce redundancy in the Montana Historical Society (MTHS) catalog. Please read the description carefully to determine which Subgroup (Division) or Sub-subgroup (Bureau, Program, Office) pertains to your research needs.

This collection contains materials from the Montana Department of Natural Resources and Conservation (1865-2009). This collection has been intellectually integrated into one Record Group, RS 496, to help facilitate access and reduce redundancy in the Montana Historical Society (MTHS) catalog. Please read the description carefully to determine which Subgroup (Division) or Sub-Subgroup (Bureau, Program, Office) pertains to your research needs.