The reaction of swamp forests to drainage in northern Minnesota /

Bureau of public roads, United States Department of agriculture, Lake states forest experiment station, Forest service, U.S. Department of agriculture, cooperating. E. V. Willard, commissioner of drainage and waters, state of Minnesota, in administrative charge of investigations.Department of drainage and waters, state of Minnesota, Department of forestry and fire prevention, state of Minnesota, Division of forestry, University of Minnesota, Division of agricultural engineering, University of Minnesota.Mode of access: Internet