1
Έκδοση 1977
“...Office of Planning and Research,...”
Βιβλίο
2
3
Έκδοση 1963
“...United States. Department of Commerce. Bureau of Public Roads. Office of Planning...”
Βιβλίο
4
Έκδοση 1969
“...New York State Office of Planning Coordination,...”
Βιβλίο