Physical description for original version: 8 p. ; 28 cm
書誌注記
Includes bibliographical references (p. 7-8)
原資料等に関する注記
原資料の出版事項: St. Paul, Minn. (1992 Folwell Avenue, St. Paul 55108) : North Central Forest Experiment Station, Forest Service--U.S. Dept. of Agriculture, 1994