BIBLIOGRAPHY 



AN extended bibliography, to do so much as approximate 

 completeness, would occupy much more space than can be 

 devoted to it here. We therefore list only a few titles and 

 indicate the general sources of information. 



1. Publications of the United States Department of Agricul- 

 ture: 



a. Farmers' Bulletins. Sent free upon application. 



Over 1100 titles have been issued and a great 

 proportion of these deal with entomology in its 

 economic aspect. 



b. Department Bulletins. Nearly a thousand of these 



have been issued in the last seven years. They 

 deal with problems in a somewhat more scientific 

 and detailed manner than do the Farmers' 

 Bulletins. A goodly number of them are upon 

 entomological subjects. 



c. Bulletins of the Bureau of Entomology. About 



130 of these were issued. They deal with a wide 

 range of subjects in the field of economic ento- 

 mology. 



d. Circulars from the Bureau of Entomology. About 



175 of these were issued. They contain brief 

 popular accounts of many of the common insects. 



e. The Journal of Agricultural Research. In this 



journal are published the results of original in- 

 vestigations. Much excellent work on insects 

 has been published in this journal. The indi- 

 vidual papers are usually obtainable as separates. 



Many of these publications are to be obtained free from 

 the Department of Agriculture. Others may be purchased 



