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Founded in 1970, the Ecology Center of Ann Arbor is a grassroots community organization committed to increasing environmental awareness. Records include meeting minutes, financial statements, correspondence, news clippings, photographs and publications relating to the activities and functions of the organization, especially in the areas of recycling, energy conservation, and ecology.

The records of the Ecology Center document the efforts of this grassroots community organization to increase environmental awareness through the establishment of recycling and energy conservation programs, and by publicizing the need for pesticide control and responsible solid waste disposal among other issues. The series in the record group are: Administrative Files, Topical Files, Printed Materials and Publicity, and Visual Materials.

The Henry Chandler Cowles photograph collection is comprised primarily of lantern slides. As a botany professor at the University of Chicago, Cowles led several field trips to observe ecological environments during the years from 1898 to 1934. The lantern slides in this collection cover the geographic areas of Michigan, Colorado, Indiana, Wisconsin, and Illinois and include photographic subjects such as dunes, plant life, forests, landscapes, and class group pictures.

The Henry Chandler Cowles photograph collection is comprised primarily of glass lantern slides from Cowles's ecology trips covering the years 1898 to 1936 with the majority being unmarked or falling between the years 1900-1912. Captions affixed to the plates are noted when available along with any numbering. Some of the handwriting is difficult to make out as are the Latin names of the plants but every attempt at correct spelling has been made. The collection is divided into seven series: Michigan Photographs, Colorado Photographs, Illinois Photographs, Indiana Photographs, Wisconsin Photographs, Miscellaneous Photographs, and Indiana Transparencies. Each state has subseries of General -- which indicates a many single location photographs -- and subseries of cities for which a group of photographs exists.

Web collection of websites created by various organizations whose service is to natural resources of the State of Michigan, archived by the Bentley Historical Library using the California Digital Library Web Archiving Service crawler from 2010-2015 and the Archive-It web archiving service beginning in 2015.

The Web Archive of Michigan's Natural Resources collection contains archived websites created by various organizations and movements concerned with preservation of natural resources in the State of Michigan. The websites have been archived by the Bentley Historical Library, using the California Digital Library Web Archiving Service crawler from 2010-2015 and the Archive-It web archiving service beginning in 2015. Access to all websites archived by the Bentley Historical Library is available at: https://archive-it.org/organizations/934.

Web Archives include websites of conservation groups, environmental organizations and nature associations who call the state of Michigan home. The collection is especially strong in documenting conservation initiatives and environmental protection in Michigan.

The year that appears next to the website title in the contents list indicates the date that the website was first archived. Archived versions of the site from later dates may also be available.