Organization of highway research summary and cases
| Egile nagusia: | |
|---|---|
| Formatua: | Liburua | 
| Hizkuntza: | English | 
| Argitaratua: | Washington, D.C.
          Highway Research Board, National Research Council
    
        1968. | 
| Saila: | Publication (National Research Council (U.S.))
              1457. Special report (National Research Council (U.S.). Highway Research Board) 99. | 
| Gaiak: |