Agricultural processing pamphlets

United States. Bureau of Agricultural Economics, H. D. Young, United States. Department of Agriculture. National Agricultural Library., F. G. Smith, Harold E. Earp, R. T. Cotton, W. P. Carroll, R. C. Miller, Dorothy Nickerson, E. A. Back, Willis B. Combs, John Herron Cox, Raymond L. Spangler, W. M. Hurst, George P. Bodnar