United farm workers Renews boycott of lettuce, RMN My 11, 1972 P.57 Catholic bishops of Colorado support boycott on non-union lettuce, Post Jy 14, 1972 P 3 RMN Jy 14, 1972 p,8 UFW differences debated. Post Ag 7, 1972 p.4 Violence predicted in 1973 grape harvest. Post Je 24, 1973 p.31 Center, Colorado, site of UFW dispute with Mel Finerman Company, nation's 2nd largest lettuce produce. RMN Jy 15, 1973 p.8,9