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Paul de NEERGAARD (1907-1987).
ESPERANTO – BOTANY: Atakoj kontraŭ ĝardenplantoj. Kaj kiel prilukti ilin [Attacks on garden plants. And how take care of them].
An unusual illustrated work on botany was originally written in Esperanto by a Danish agronomist and Esperantist Paul de Neergaard.
ESPERANTO – RACIAL THORIES: Scienco kaj pseŭdoscienco pri heredo kaj raso: populara skizo [Science and pseudoscience about heritage and race. A popular sketch],
An uncommon work by a Danish scientist in Esperanto with scientific explanations on the development racial distinctions, was published on the eve of WWII and was opposing racism.