Isecke, E., Meyer, H., Neuer, H., & Sengbusch, R. v. (1942). Steigerung unserer Kohlerzeugung (Kopfkohl) durch Verwendung von "Kopfsaatgut" statt "Sämlingssaatgut". Schulungsbriefe des Reichsverbandes der Pflanzenzucht, (35).  [pubman]

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