Geerd Jürgens

Orchideenforscher

Born: 1937

Has participated in:

Vergleichende Untersuchungen über die Wirkung von wasserfreiem Ammoniak, Stickstoff-Lösungen und Stickstoff-Salzdüngemitteln
Orchid bibliography : publications by members of the Orchid Society Kurpfalz e.V., including the numerous publications of Karlheinz Senghas' Index of the recorded literature until 2011 =...
Vergleichende Untersuchungen über die Wirkung von wasserfreiem Ammoniak, Stickstoff-Lösungen und Stickstoff-Salzdüngemitteln

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Geerd Jürgens

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