Many sites are protected and maintained by government bodies or non-profit organizations such as The Nature Conservancy, the Wisconsin and Minnesota Departments of Natural Resources, and the Iowa Natural Heritage Foundation.
Iowa | National Science Foundation | National Trust for Places of Historic Interest or Natural Beauty | World Heritage Site | University of Iowa | American Museum of Natural History | Ford Foundation | Rockefeller Foundation | Natural History Museum | Iowa State University | Des Moines, Iowa | Davenport, Iowa | English Heritage | natural history | Field Museum of Natural History | John Simon Guggenheim Memorial Foundation | natural gas | Ames, Iowa | Natural environment | Electronic Frontier Foundation | Dubuque, Iowa | Bill & Melinda Gates Foundation | National Museum of Natural History | Sioux City, Iowa | New York Foundation for the Arts | Cedar Rapids, Iowa | Natural history | Mozilla Foundation | Guggenheim Foundation | Iowa City, Iowa |