Descriptive catalogue of the road models of the Office of Public Roads . Model of a Water-Bound Macadam Road. 47, Office of Public Roads, U. S. Dept. of Agricultur Plate Model of a Bituminous Macadam Road—Penetration Method. Bui. 47, Office of Public Roads, U. S. Dept. of Agriculture. Plate XI.

---

Size: 1601px × 1562px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No

Keywords: ., bookcentury1900, bookdecade1910, bookiddescriptivec, bookyear1913