Waldman, Sidney R. ; Richards, Susan ; Walker, Charles C., The Edgewood Arsenal and Fort Detrick Projects: an Exchange Analysis , Haverford PA, Center for Nonviolent Conflict Resolution, 1967, pp. 67 ‘Exchange analysis’ between organizers of two protests against Chemical and Biological Weapons (CBW) weapons production, the first a 21 month campaign at Fort Detrick from January 1960, the second planting a tree inside the base.