Highway improvement.
By: by E.F. Ayres.
Contributors: Oregon Agricultural College. Extension Division.
Series: College bulletin -- no. 67.; Extension series -- 4, no. 1.; College bulletin (Oregon Agricultural College. Extension Division) -- no. 67.; Extension series 4 -- no. 1.
Published: 1912
Place of publication: [Corvallis
Language: eng
Number of pages: 79
Subjects: Culverts.; Roads, Earth.; Roads, Earth -- Maintenance and repair.
Other titles: Earth roads and culverts.
Notes: Also issued online.