Hoyt, Charles Hamilton, Burr, William H. (William Hubert), 1851-1934, United States. Bureau of Public Roads · Washington : U.S. Dept. of Agriculture, Office of Public Roads : G.P.O. · leaf 22
Fig. 1.—A Type of Culvert to be Avoided. … Fig. 2.—A Better Type of Culvert. Bui. 43, Office of Public Roads, U. S. Dept. of Agriculture. Plate VI.
Bridges Design and construction · Culverts
Internet Archive · Public Domain Mark 1.0. Free to use for anything.
