Physical description for original version: 43 p. in various pagings : 28 cm
原資料等に関する注記
原資料の出版事項: [Washington, D.C.?] ; [Ottawa, Ont.?] ; [Mexico City, Mexico?] : U.S. Dept. of the Interior, Fish and Wildlife Service : Environment Canada, Canadian Wildlife Service : Secretaria de Desarrollo Social, [1994]