00509nam a2200169Ia 4500 CTU_87178 210402s9999 xx 000 0 und d 351.82 I.42 Industrial property statistics 1978=Statistiques de propriete industrielle Geneva World Intellectual Property Organization 1980 patents statistics,periodicals Tuyến Trung tâm Học liệu Trường Đại học Cần Thơ