Wollenwever, H. W., and C. Stapp. 1928. Untersuchungen uber die als Ulmensterben bekannte Baumkrankheit. Arbeiten aus der Biologischen Reishsanstalt fur Land- und Forstwirtschaft 16:283-324, 3 Taf., 8 figs.
Wollenwever & Stapp 1928
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