"Cotton gin operating costs in the San Joaquin Valley of California, 1971 / 72" . . . . . "Cotton gin operating costs in the San Joaquin Valley of California, 1971/72" . "Cotton gin operating costs in the San Joaquin Valley of California, 1971/72"@en . . . . . . . . . . "Cotton gin operating costs in the San Joaquin Valley of California, 1971/72 and 1972/73" . . . . . . . . . . .