(1961). A policy on landscape development for the National System of Interstate and Defense Highways. Washington, D.C: American Association of State Highway Officials.
Παραπομπή Chicago StyleA Policy On Landscape Development for the National System of Interstate and Defense Highways. Washington, D.C: American Association of State Highway Officials, 1961.
Παραπομπή MLAA Policy On Landscape Development for the National System of Interstate and Defense Highways. Washington, D.C: American Association of State Highway Officials, 1961.
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