00283nam a2200109Ia 450000500170000000800410001708200120005810000170007024500440008726000340013130000080016520260224040846.0260224s9999||||xx |||||||||||||| ||und||  a382 HOU  aHouck, J.P.  0aElements of agricultural trade policies  aNew York: Macmillan Co.c1986  a191