Bike Maryland:   http://www.bikemd.org

League of American Bicyclists:   http://www.bikeleague.org/

East Coast Greenway:    http://www.greenway.org/

Adventure Cycling Association: “http://en.wikipedia.org/wiki/Adventure_Cycling_Association

Advocacy Advance http://www.advocacyadvance.org/

Alliance for Biking and Walking: http://www.peoplepoweredmovement.org

Bikes Belong: http://bikesbelong.org/

National Bicycle Greenway: http://en.wikipedia.org/wiki/National_Bicycle_Greenway

People For Bikes http://www.peopleforbikes.org/

Rails-to-Trails Conservancy: http://en.wikipedia.org/wiki/Rails-to-Trails_Conservancy