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21. Report of director of Office of Public Roads [fiscal year 1913].

Corporate/Agency Authors:: Public Roads Office and Agriculture Department
Publisher:: Public Roads Office
Date:: [1913.]

22. Progress reports of experiments in dust prevention and road preservation. 1911.

Corporate/Agency Authors:: Public Roads Office and Agriculture Department
Publisher:: Public Roads Office
Date:: Dec. 12, 1912

23. Benefits of improved roads, Sept. 26, 1912.

Corporate/Agency Authors:: Public Roads Office and Agriculture Department
Publisher:: Public Roads Office
Date:: [October 1912]

24. Oil-mixed Portland cement concrete; by Logan Waller Page.

Corporate/Agency Authors:: Public Roads Office and Agriculture Department
Publisher:: Public Roads Office
Date:: Aug. 8, 1912

25. Physical testing of rock for road building including methods used and results obtained; by Albert T. Goldbeck and Frank H. Jackson, jr.

Corporate/Agency Authors:: Public Roads Office and Agriculture Department
Publisher:: Public Roads Office
Date:: June 10, 1912

26. Highway bridges and culverts; by Charles H. Hoyt and William H. Burr.

Corporate/Agency Authors:: Public Roads Office and Agriculture Department
Publisher:: Public Roads Office
Date:: Apr. 6, 1912

27. Mileage and cost of public roads in United States, [calendar year] 1909; by J. E. Pennybacker, jr., and Maurice O. Eldridge.

Corporate/Agency Authors:: Public Roads Office and Agriculture Department
Publisher:: Public Roads Office
Date:: Feb. 29, 1912

28. Coke-oven tars of United States; by Prevost Hubbard.

Corporate/Agency Authors:: Public Roads Office and Agriculture Department
Publisher:: Public Roads Office
Date:: Feb. 7, 1912

29. New Hampshire highways, report of inspection of highways in New Hampshire, Aug. 1911; by Charles H. Hoyt.

Corporate/Agency Authors:: Public Roads Office and Agriculture Department
Publisher:: Public Roads Office
Date:: Feb. 6, 1912

30. Mileage and cost of public roads in United States, [calendar year] 1909; by J. E. Pennybacker and Maurice O. Eldridge.

Corporate/Agency Authors:: Public Roads Office and Agriculture Department
Publisher:: Public Roads Office
Date:: Jan. 26, 1912

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