BRIEF [O.A.] Scherzer, Ritter Karl von Author: Scherzer, Ritter Karl von Recipient: Haeckel, Ernst Dating: 17.02.1876
BRIEF [O.A.] Scherzer, Ritter Karl von Author: Scherzer, Ritter Karl von Recipient: Haeckel, Ernst Dating: 07.03.1876
BRIEF [O.A.] Scheller, Ferdinand Author: Scheller, Ferdinand Recipient: Haeckel, Ernst Dating: 06.10.1876