Appalachian Long Distance Hikers Association

The Appalachian Long Distance Hikers Association is a non-profit organization founded in 1983 to support and promote the interests of long-distance hikers in the Appalachian mountain area and east of the Mississippi. It "was the first organization of long-distance hikers in the United States".

Source: Wikipedia — Appalachian Long Distance Hikers Association (CC BY-SA 4.0)