PUBLICATIONS OF THE U. S. DEPARTMENT OF AGRICULTURE RELAT- 
ING TO PUBLIC 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 Pavemento for Country Roads. (Department Bulletin 249.) 
Methods for the Examination of Bituminous Road Materials. (Department Bulletin 
314.) 
Methods for the Determination of Physical Properties of Road-building Rock. (De- 
partment Bulletin 347.) 
Macadam Roads. (Farmers' Bulletin 338.) 
Benefits of Improved Roads. (Farmers' Bulletin 505.) 
Road Drag and How Used. (Farmers' Bulletin 597.) 
Repair and Maintenance of Highways. (Roads Bulletin 48.) 
FOR SALE BY THE SUPERINTENDENT OF DOCUMENTS, GOVERNMENT PRINTING OFFICE, 
WASHINGTON, D. C. 
Highway Bonds: A Compilation of Data and an Analysis of Economic Features Affect- 
ing Construction and Maintenance of Highways Financed by Bond Issues, and the 
Theory of Highway Bond Calculations. (Department Bulletin 136.) Price, 25 
cents. 
Vitrified Brick Pavement for Country Roads. (Department Bulletin 246.) Price, 10 
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. " 
Construction of Macadam Roads. (Roads Bulletin 29.) Price, 10 cents. 
Road Materials of Southern and Eastern Maine. (Roads Bulletin 33.) Price, 20 
cents. 
Dust Preventives. (Roads Bulletin 34.) Price, 15 cents. 
Examination and Classification of Rocks for Road Building, Including Physical Prop- 
ertiesoi Rocks with Reference to Their Mineral Composition and Structure. (Roads 
Bulletin 37.) Price, 15 cents. 
Road Material Resources of Minnesota. (Roads Bulletin 40.) Price, 10 cents. 
Physical Testing of Rock for Road Building, Including Methods Used and Results 
Obtained. (Roads Bulletin 44.) Price, 15 cents. 
Descriptive Catalogue of Road Models of Office of Public Roads. (Roads Bulletin 47.) 
Price, 15 cents. 
Bitumens and Their Essential Constituents for Road Construction and Maintenance. 
(Roads Circular 93.) Price, 5 cents. 
Special Road Problems in Southern States. (Roads Circular 95.) Price, 5 cents. 
Progress Report of Experiments in Dust Prevention and Road Preservation, 1912. 
(Roads Circular 99.) Price, 5 cents. 
Use of Split-log Drag on Earth Roads. (Farmers' Bulletin 321.) Price, 5 cents. 
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