00576nam a2200193Ia 4500 CTU_83450 210402s9999 xx 000 0 und d 382.1 K394 Maskus, Keith E. The changing structure of comparative advantage in American manufacturing Keith E. Maskus Ann Arbor- Michigan Umi Research Press 1981 Manufacturing industries United States QHieu(sửa) Trung tâm Học liệu Trường Đại học Cần Thơ