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1Gepubliceerd in 1977“...National Technical Information Service, U.S. Dept. of Commerce,...”
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2Gepubliceerd in 1995“...U.S. Dept. of Transportation, Federal Highway Administration, Research and Development, Turner-Fairbank Highway Research Center ; Available to the public through the National Technical Information Service,...”
Overheidsdocument Conferentie akten Microfilm Boek