 | Pendulum impact tests of wooden and steel highway guardrail posts | (1) |
 |
 | Pendulum impact tests of wooden and steel highway guardrail posts / by Charles J. Gatchell and Jarvis D. Michie. Gatchell, Charles J. cn Upper Darby, Pa. : Forest Service, U.S. Dept. of Agriculture, Northeastern Forest Experiment Station, 1974. | |
|