LABORATORY MANUAL IN FIELD CROPS 9 



REFERENCES 



United States Department of Agriculture, Yearbook 1913, Average 

 yields per acre. 



Livingston's Field Crop Production, pp. 61-71, 54. 

 Farmers' Bulletins Nos. 303, 313, 414. 

 Hunt's Cereals in America, pp. 398-427. 



