1
Έκδοση 1974
“...State of California. Department of Public Works. Division of Highways,...”
Βιβλίο
2
Βιβλίο
3
Έκδοση 1963
“...California. Department of Public Works. Division of Highways...”
Βιβλίο
4
Έκδοση 1956
“...California. Department of Public Works. Division of Highways. Materials and Research Department...”
Βιβλίο