Central hardwood notes /

St. Paul, Minn. : Washington, D.C. : U.S. Dept. of Agriculture, Forest Service, North Central Forest Experiment Station ; For sale by the Supt. of Docs., U.S. G.P.O., 1989

Northern hardwood notes /

St. Paul, Minnesota : Washington, D.C. : U.S. Department of Agriculture, Forest Service, North Central Forest Experiment Station ; For sale by the Superintendent of Documents., U.S. Government Printing Office, 1985