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Industry wage survey : fertilizer manufacturing, April 1962
O'Connor, Charles M., (1963)
Industry wage survey : fertilizer, March-April 1971
Ridzon, Donald S., (1972)
Fertilizer industry
Sittig, M., (1979)
Minimum wage effects studies
Schaffer, Herbert, (1959)
Sunbury, Shamokin, Mount Carmel, Penns.
Athens, Georgia