1
Έκδοση 1974
“...Department of Transportation. Federal Highway Administration...”
Βιβλίο
2
Έκδοση 1976
“...U.S. Department of Transportation. Federal Highway Administration,...”
Βιβλίο
3
Έκδοση 1998
“...U.S. Department of Transportation. Federal Highway administration...”
Βιβλίο
4
Έκδοση 1975
“...U.S. Department of Transportation. Federal Highway Administration,...”
Βιβλίο