Apparently 1960 per the magazines "Fleet Owner" and "Automotive Daily News":
https:www.google.ca/books/edition/Fleet_Owner/9f8iAQAAMAAJ
https:www.google.ca/books/e dition/Automotive_Daily_News/AMwxAQAAMAAJ
"The booklet entitled 'New American Frontier,' is a project of the Pure Oil Co. for the ATA Foundation, the public information , education and research organization for supplier support of the American trucking industry."
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