Forest Service and Extension Service [U.S.A.]
United States Department of Agricultur.
Jacentkovský, Dimitrij (1898–1945)
Scholz, Richard (1866–1935)
Masłowski, Ludwik (1895–1940) Masłowski, Marian Piotr (1898–1945)
Walker, James John (1851–1939)
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