Usage:
| American Farmland Trust |
| American Indian College Fund |
| American Red Cross |
| Arbor Day Foundation |
| Atlanta Botanical Garden |
| Barnes Foundation, The |
| California State Parks Foundation |
| Central Park Conservancy |
| Chesapeake Bay Trust |
| Children's Medical Center Fdtn |
| Consumer Reports |
| Cornell Lab Of Ornithology |
| Denver Museum of Nature & Science |
| Ducks Unlimited |
| Earthjustice |
| Environmental Defense Fund |
| Food Banks Consortium |
| Friends of the Earth |
| Friends of the Forest Preserves |
| Grand Canyon Conservancy |
| Greater Chicago Food |
| Greater Public |
| Green Chimneys |
| High Country News |
| Humane Society Consortium |
| International Crane Foundation |
| Jane Goodall Institute, The |
| KBTC Public Television |
| Keepers of the Wild |
| KQED, Inc. |
| KVIE Channel 6 |
| League of Conservation Voters |
| League of Women Voters |
| Los Angeles Mission |
| Massachusetts Audubon Society |
| Meals on Wheels Co-Op |
| Memorial Park Conservancy |
| Minnesota Conservation Volunteer |
| Minnesota Public Radio |
| Mono Lake Committee |
| MSPCA |
| National Center For Science Educ. |
| National Geographic Development |
| National Museum American Indian |
| National Park Foundation |
| National Parks Conservation Assoc |
| Natural Resources Defense Council |
| New Hampshire Food Bank |
| New Jersey Audubon |
| NY Landmarks Conservancy, The |
| Ocean Conservancy, The |
| Ohio Environmental Council |
| Oregon Environmental Council |
| Palm Beach County Food Bank |
| Parks & Trails Council of MN |
| Parks & Trails New York |
| Peninsula Open Space Trust |
| Public Radio/Television |
| Public Television |
| Rescue Missions |
| Salvation Army/Southern Californi |
| Sierra Club |
| Smithsonian Magazine |
| Space Center Houston |
| SPCA of Texas |
| Tree People |
| Trust For Public Land |
| Trustees of Reservations |
| Turtle Island Restoration Network |
| UNC Public TV |
| WETA/Channel 26 |
| WFMT Chicago Public Radio |
| Wilderness Society |
| Woods Hole Oceanographic |
| WTTW/Channel 11 |
| Yellowstone Forever |
| Zoo Consortium |
