State of Arizona, complainant, v. State of California, Palo Verde Irrigation District, Imperial Irrigation District, Coachella Valley County Water District, the Metropolitan Water District of Southern California, City of Los Angeles, City of San Diego, and County of San Diego, defendants : United States of America and State of Nevada, interveners, State of New Mexico and State of Utah, parties : before the Hon. Simon H. Rifkind, special master : response of California defendants June 1, 1959 to findings, conclusions and briefs proposed by other parties April 1, 1959