BRIEF [O.A.] Nowicki, Maximilian Author: Nowicki, Maximilian Recipient: Haeckel, Ernst Dating: 09.06.1871
BRIEF [O.A.] Nowicki, Maximilian Author: Nowicki, Maximilian Recipient: Haeckel, Ernst Dating: 18.01.1873
BRIEF [O.A.] Nowicki, Maximilian Author: Nowicki, Maximilian Recipient: Haeckel, Ernst Dating: 19.12.1873
BRIEF [O.A.] Szarlitt, Bernard Author: Szarlitt, Bernard Recipient: Haeckel, Ernst Dating: 18.03.1903
BRIEF [O.A.] Zachariewicz, Julian von Author: Zachariewicz, Julian von Recipient: Haeckel, Ernst Dating: 10.06.1918