Chavez, Cesar. Why We Boycott. Keene, California: United Farm Workers of America, 1973. First Edition.
Oblong, 8 1/2 x 5 1/2 inches, 31 pp. of photographs & text, introduction by Cesar Chavez. Very good. Paperback. 
A photographic record of the UFWA 1973 grape boycott, with focus on abuses by the police and the Teamsters Union. A chronology of violence committed against the Coachella Valley grape workers is at the end of the booklet.