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Mammals Imported Into the United States in 1971

出版	United States Department of the Interior, Fish and Wildlife Service, Bureau of Sport Fisheries and Wildlife, 1973
URL	http://books.google.com.hk/books?id=Yup9zwEACAAJ&hl=&source=gbs_api

註釋Mammals imported into the United States in 1971 are tabulated by species and country of origin. Total numbers imported from 1968 through 1971 are given for higher taxa and for species most frequently imported. The numbers of mammals imported in 1971 decreased slightly from those imported in 1970 largely as a result of decreased importation of rabbits from Canada. Lists of rare and endangered species imported and of mammals whose importation is restricted are also given.