The use of Iowa gravel for concrete Agg, Thomas Radford 1878- creator Nichols, Charles Sabin 1883- joint author. text iau Ames, Ia Iowa State College of Agriculture and Mechanic Arts 1913 monographic eng
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31 p. illus., diagrs. 22 cm. by T. R. Agg and C. S. Nichols. At head of title: Bulletin of Iowa State College of Agriculture and Mechanic Arts, vol. XII, Dec. 1, 1913, no. 20. Concrete Gravel TN939 .A3 Bulletin 34, Engineering Experiment Station. Good Roads Section gs 14000470 U. S. Geol. survey. Library. 780714 20260227111315.0 gs 14000470