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Labor and equipment use 

, In: Alternative methods of feeding : commercial dairy herds in the Northeast / B. F. Stanton and C. W. Loomis
Pt. 1,
Bulletin / Cornell University, Agricultural Experiment Station ; 1018
Stanton, Bernard F. ; Loomis, C. W. , 1967
Exemplar:  Zentrale:Magazin cb 8822-1