Management of nutrition in forests under stress : proceedings of the international symposium ... at the Albert-Ludwigs-University in Freiburg, Germany, held on September 18-21, 1989 at Freiburg, Germany / guest ed.: H. W. Zöttl and R. F. Hüttl

Management of nutrition in forests under stress : proceedings of the international symposium ... at the Albert-Ludwigs-University in Freiburg, Germany, held on September 18-21, 1989 at Freiburg, Germany / guest ed.: H. W. Zöttl and R. F. Hüttl