Physical description for original version: v, 127 p. : 23 cm
原資料等に関する注記
原資料の出版事項: Broomall, Pa. ; Washington, D.C. : Forest Service, U.S. Dept. of Agriculture, Northeastern Area, State and Private Forestry : For sale by the Supt. of Docs., U.S. G.P.O., 1979