Dubuque Audubon Society
- Provides educational opportunities to the people of the tri-state area and preserves the natural habitat of birds and other wildlife. Includes information about meetings, programs, field trips, membership and newsletter.
- http://www.audubondubuque.org/

Mines of Spain
- Recreation area and interpretive nature center located on 1380 acres of wooded and prairie land, and designated as a National Historic Landmark. Includes its history, a calendar of events, trail guides, newsletters, maps and a membership form.
- http://www.minesofspain.org/

Dubuque Arboretum and Botanical Gardens
- Staffed entirely by volunteers, who maintain the grounds of the largest public hosta garden in the United States. Includes program schedules, hours, photos, special collections, and wedding ceremony details.
- http://www.dubuquearboretum.com/