| 其他書名 | Held at the Ohio State University, Columbus, Ohio, Under the Direction of the Dept. of Civil Engineering, the Ohio State University and the Ohio Dept. of Highways, Jan. 24-26, 1949 |
| 出版 | College of Engineering, Ohio State University, 1948 |
| URL | http://books.google.com.hk/books?id=wThJAQAAMAAJ&hl=&source=gbs_api |