00470nam a2200157Ia 4500001001100000005001700011008004100028050001600069090000800085245007700093260003600170300003000206504003200236651002900268999001500297000000564920251012174614.0  720218s1963    maua     b    000 0 eng00aHF3021b.V2  a38214aThe natural resource content of United States foreign trade, 1870-1955.   aCambridge,bM.I.T. Pressc1963   axvi, 142 pbillusc24 cm.  aBibliographical footnotes.  0aUnited StatesxCommerce.  c7069d7069