LABORATORY MANUAL IN FIELD CROPS 57 



REFERENCES 



United States Department of Agriculture, Office of Experiment Stations 



Bulletin No. 33. 



United States Department of Agriculture, Year Book 1912. 

 Farmers' Bulletins Nos. 216, 223, 290, 48, 47, 217. 

 C. P. Brooks' Cotton, Its Uses and Varieties. 



