The Michigan Natural Areas Council papers document environmental advocacy activities in Michigan from the mid 1940s through 2006. The record group includes numerous reports and articles on natural areas in Michigan, legislative proceedings regarding those areas, photos, slides, correspondence between Michigan's myriad environmental groups, data collected on the natural areas, and maps.
The MNAC records are organized into three series: Administrative Files, Natural Areas Files, and Site Files. The record group documents the Michigan Natural Areas Council's activities and structure from 1934 to 2006, including some materials relating to the MNAC's administration and organization. The bulk of the files relate to the group's efforts to identify and dedicate natural areas in the state of Michigan. There is also some information relating to other Michigan naturalist groups that worked with MNAC members.