1
Έκδοση 1968
“...United States. Department of Transportation. State Highway Commission...”
Βιβλίο
2
Έκδοση 1976
“...United States. Department of Transportation. Federal Highway Administration...”
Βιβλίο
3
Έκδοση 1975
“...United States. Department of Transportation. Federal Highway Administration...”
Βιβλίο
4
Έκδοση 1971
“...United States. Department of transportation. Strategic Planning Dvision...”
Βιβλίο
5
Έκδοση 1965
“...United States. Department of Transportation...”
Βιβλίο
6
Έκδοση 1969
“...United States. Department of Transportation. Federal Railroad Administration. Office of High Speed...”
Βιβλίο