Physical description for original version: 1 folded sheet (6 p.) : 23 cm
書誌注記
Includes bibliographical references (p. [5])
原資料等に関する注記
原資料の出版事項: [Washington, DC] : Dept. of the Interior, U.S. Fish and Wildlife Service : Available from Publications Unit, U.S. Fish and Wildlife Service, 1990