00932cam a22002531 4500 gs 14000470 DLC 20260227111315.0 780714s1913 iaua s000 0 eng c gs 14000470 (OCoLC)4053812 U. S. Geol. survey. Library. GAT DLC premarc TN939 .A3 Agg, Thomas Radford, 1878- The use of Iowa gravel for concrete, by T. R. Agg and C. S. Nichols. Ames, Ia., Iowa State College of Agriculture and Mechanic Arts, 1913. 31 p. illus., diagrs. 22 cm. Bulletin 34, Engineering Experiment Station. Good Roads Section At head of title: Bulletin of Iowa State College of Agriculture and Mechanic Arts, vol. XII, Dec. 1, 1913, no. 20. Concrete. Gravel. Nichols, Charles Sabin, 1883- joint author. 25363 25363