LETTER OF TRANSMITTAL 
U. S. Department of Agriculture, 
Office of Experiment Stations, 
Washington, D. C, December U h 1906. 
Sir: I have the honor to transmit herewith, and to recommend for 
publication as Bulletin No. 180 of this Office, a list of the publications 
issued by the agricultural experiment stations in the United States 
from the time of their organization to June 30, 1906. It is believed 
that such a list will be of use to librarians and many others interested 
in keeping track of these publications, which now constitute in them- 
selves a library of agricultural investigation in the United States of 
much importance. 
Respectfully, A. C. True, 
Director. 
Hon. James Wilson, 
Secretary of Agriculture. 
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