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Potomac Trail Council, an alliance of community organizations and local agencies committed to the development, protection, and celebration of the Potomac Heritage National Scenic Trail.

The premier rock climbing, ice climbing and mountaineering club serving the D.C. Metro area since 1944.

police training classes and courses for law enforcement. Welcome to the Public Agency Training Council, the largest law enforcement training company in the United States. We offer over 100 courses of academy quality training, including Use of force training, crime scene investigation training, hostage negotiation training, homicide investigation training, interview and interrogation training and

The Appalachian Trail Conservancy is a volunteer-based, private nonprofit organization dedicated to the conservation of the 2,175-mile Appalachian National Scenic Trail, a 250,000-acre greenway extending from Maine to Georgia.