Funded by the National Science Foundation PEET program (Partnerships for Enhancing Expertise in Taxonomy)
Schimitschek, E. 1969. Grundzuge der Waldhygiene, Wege zur okologischen Reglung, ein Leitfaden [Outlines of the forest hygiene: methods of ecological regulation, an introduction]. Paul Parey, Hamburg. 167 p., 44 figs.
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