PUBLICATIONS OF THE UNITED STATES DEPARTMENT OF AGRICULTURE 
RELATING TO ROADS AND ROAD-BUILDING MATERIALS. 
AVAILABLE FOR FREE DISTRIBUTION. 
Repair and Maintenance of Highways. (Roads Bulletin 48.) 
Highway Bonds. (Department Bulletin 136.) 
Road Models. (Department Bulletin 220.) 
Portland Cement Concrete Pavements for Country Roads. (Department Bulletin 249.) 
Sand-clay and Burnt-clay Roads. (Farmers' Bulletin 311.) 
Macadam Roads. (Farmers' Bulletin 338.) - 
Benefits of Improved Roads. (Farmers' Bulletin 505.) 
The Road Drag and How it is Used. (Farmers' Bulletin 597.) 
Oil-mixed Portland Cement Concrete. (Department Bulletin 230.) 
FOR SALE BY THE SUPERINTENDENT OF DOCUMENTS. 
The Construction of Macadam Roads. (Roads Bulletin 29.) Price, 10 cents. 
Road Materials of Southern and Eastern Maine. (Roads Bulletin 33.) Price, 20 
cents. 
Examination and Classification of Rocks for Road Building, Including the Phys- 
ical Properties of Rocks with Reference. to their Mineral Composition and Structure. 
(Roads Bulletin 37.) Price, 15 cents. 
Methods for the Examination of Bituminous Road Materials. (Roads Bulletin 38.) 
Price, 10 cents. 
Constructing Macadamized Roads. (Roads Circular 21.) Price, 5 cents. 
Bitumens and their Essential Constituents for Road Construction and Maintenance. 
(Roads Circular 93.) Price, 5 cents. 
Vitrified Brick Pavements for Country Roads. (Department Bulletin 246.) Price, 
10 cents. 
Use of the Split-log Drag on Earth Roads. (Farmers' Bulletin 321.) Price, 5 
cents. 
Selection of Materials for Macadam Roads. (Separate 204 from the Yearbook 1900.) 
Price, 5 cents. 
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