BRIEF [O.A.] Weinland, David Friedrich Author: Weinland, David Friedrich Recipient: Haeckel, Ernst Dating: 18.03.1888
BRIEF [O.A.] Weinland, David Friedrich Author: Weinland, David Friedrich Recipient: Haeckel, Ernst Dating: 27.03.1888
BRIEF [O.A.] Weinland, David Friedrich Author: Weinland, David Friedrich Recipient: Haeckel, Ernst Dating: 15.05.1885