Ahlgren, C.E. 1979. Buried seed in the forest floor of the Boundary Waters Canoe Area. Minnesota Forestry Research Notes No. 271. St. Paul, MN: University of Minnesota, College of Forestry. 4 p.
Ahlgren, C.E. 1979. Buried seed in the forest floor of the Boundary Waters Canoe Area. Minnesota Forestry Research Notes No. 271. St. Paul, MN: University of Minnesota, College of Forestry. 4 p.