PUBLICATIONS OF THE U. S. DEPARTMENT OF AGRICULTURE RELATING 
TO ROADS. 
AVAILABLE FOR FREE DISTRIBUTION BY THE DEPARTMENT. 
Progress Reports of Experiments in Dust Prevention and Road Preservation, 1913. 
(Department Bulletin 105.) 
Road Models. (Department Bulletin 220.) 
Portland Cement Concrete Pavements for Country Roads. (Department Bulletin 
249.) 
Progress Reports of Experiments in Dust Prevention and Road Preservation, 1914. 
(Department Bulletin 257.) 
Methods for the Examination of Bituminous Road Materials. (Department Bulletin 
314.) 
Methods for the Determination of the Physical Properties of Road-building Rock. 
(Department Bulletin 347.) * 
Results of Physical Tests of Road-building Rock. (Department Bulletin 370.) 
Brick Roads. (Department Bulletin 373.) 
Public Road Mileage and Revenues in the Middle Atlantic States, 1914. (Depart- 
ment Bulletin 386.) 
Progress Reports of Experiments in Dust Prevention and Road Preservation, 1911. 
(Roads Circular 98.) 
State Highway Mileage and Expenditures to January 1, 1915. (Secretary's Circular 
52.) 
Automobile Registrations, Licenses, and Revenues in the United States, 1915. (Sec- 
retary's Circular 59.) 
Rules and Regulations of the Secretary of Agriculture for Carrying Out the Federal 
Aid Road Act. (Secretary's Circular 65.) 
Sand-clay and Burnt-clay Roads. (Farmers' Bulletin 3.11.) 
Macadam Roads. (Farmers' Bulletin 338.) 
Benefits of Improved Roads. (Farmers' Bulletin 505.) 
Road Drag and How Used. (Farmers' Bulletin 597.) 
FOR SALE BY THE SUPERINTENDENT OF DOCUMENTS, GOVERNMENT PRINTING 
OFFICE, WASHINGTON, D. C. 
Highway Bonds, Compilation of Data and Analysis of Economic Features Affecting 
Construction and Maintenance of Highways Financed by Bond Issues, and Theory 
of Highway Bond Calculations. (Department Bulletin 136.) Price, 25 cents. 
Construction and Maintenance of Roads and Bridges from July 1, 1913, to December 
31, 1914. (Department Bulletin 284.) Price, 10 cents. 
Relation of Mineral Composition and Rock Structure to the Physical Properties of 
Road Materials. (Department Bulletin 348.) Price, 10 cents. 
Road Materials of Southern and Eastern Maine. (Roads Bulletin 33.) Price, 20 
cents. 
Road Material Resources of Minnesota. (Roads Bulletin 40.) Price, 10 cents. 
Bitumens and Their Essential Constituents for Road Construction and Maintenance. 
(Roads Circular 93.) Price, 5 cents. 
Progress Reports of Experiments in Dust Prevention and Road Preservation, 1910. 
(Roads Circular 94.) Price, 5 cents. 
Special Road Problems in Southern States. (Roads Circular 95.) Price, 5 cents. 
Progress Reports of Experiments in Dust Prevention and Road Preservation, 1912. 
(Roads Circular 99.) Price, 5 cents. 
12 
