1993 Jerry Garcia© edition Hard Rock Cafe t-shirt. The design by Jerry Garcia was designed for "River keeper"! Riverkeeper is an Environmental organization, a non-profit environmental organization dedicated to the protection of the Hudson River and its tributaries, as well as the watersheds that provide New York City with its drinking water. It started out as the Hudson River Fisherman's Association in 1966. Riverkeeper evolved from Pete Seeger's grassroots activism that used a wooden sloop to draw attention to pollution in the Hudson River. Wikipedia size M