This collection consists of yearly programs, diaries, and newspaper clippings from the Springfield Nature League, formed in 1932 when some local citizens from various nature organizations decided to focus their nature and conservation efforts on one central club. The Nature League was an active group, with an ambitious program of monthly lectures, early morning tramps, museum tours, nature exhibitions and even an affiliation with the Illinois State Museum in establishing a series of classes which led to a certificate of Amateur Naturalist. The League also sponsored several young people's groups in the areas and provided custodianship of the Wildlife Sanctuary at Lake Springfield. Also included in this collection are membership lists from 1934-1949. By 1960, the Nature League had merged with the National Audubon Society and became the Springfield Audubon Society.