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