associations

American Planning Association Policy Guide on Smart Growth
American Planning Association Policy Guide on Surface Transportation
Economic Benefits of Open Space
Economic Value of Walkability 
Elements of Smart Growth - Smart Growth America
National Charrette Institute - Healthy Communities
Rails to Trails Conservancy
Rails-Trails and Safe Communities:  The Experience on 372 Trails
Thunderhead Alliance Bicycle Advocacy
Trails and Greenways Clearinghouse
Trinity Trust  
The Rivers, Trail, and Conservation Assistance Program