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Post mortem on the import surcharge
Ray, George Frank, (1967)
U.S. import surcharge on agricultural products
(1971)
Die spanischen Einfuhrabgaben und Ausfuhrregelungen
Selling, Heinz-Juergen, (1987)
Industrial materials : past, present and future
Ray, George F., (1983)
Innovation in materials
Ray, George Frank, (1986)
[Rezension von: Leontief, Wassily, The future impact of automation on workers]
Ray, George Frank, (1987)