Proceedings of the twenty-eighth annual meeting - Highway Research Board : held at Washington, D.C., December 7 - 10, 1948

Crum, Roy W. | TIBKAT | 1949

Proceedings of the twenty-seventh annual meeting - Highway Research Board : held at Washington, D.C., December 2 - 5, 1947

Crum, Roy W. | TIBKAT | 1948

Proceedings of the twenty-ninth annual meeting - Highway Research Board : held at Washington, D.C., December 13- 16, 1949

Crum, Roy W. | TIBKAT | 1950

Proceedings of the twentieth annual meeting - Highway Research Board : held at Washington, D.C., December 3 - 6, 1940

Crum, Roy W. | TIBKAT | 1940

Proceedings of the twenty-fourth annual meeting - Highway Research Board : [Washington, D.C., 1944], (unassembled)

Crum, Roy W. | TIBKAT | 1944