[Dr. Hubert Schumann--60 years].
Ribbeck
R
R
Müller
P
P
Hartwich
G
G
D001634:Bibliographies as Topic; D004772:Entomology / Q000266:history; D005859:Germany, East; D049673:History, 20th Century
Dr. rer. nat. Hubert Schumann--60 years.