BRIEF [O.A.] Neumann, Carl W... Author: Neumann, Carl W... Recipient: Haeckel, Ernst Dating: 15.02.1912
BRIEF [O.A.] Neumann, Carl W... Author: Neumann, Carl W... Recipient: Haeckel, Ernst Dating: 06.03.1912
BRIEF [O.A.] Neumann, Carl W... Author: Neumann, Carl W... Recipient: Haeckel, Ernst Dating: 12.03.1912
BRIEF [O.A.] Neumann, Carl W... Author: Neumann, Carl W... Recipient: Haeckel, Ernst Dating: 22.03.1912
BRIEF [O.A.] Neumann, Carl W... Author: Neumann, Carl W... Recipient: Haeckel, Ernst Dating: 09.04.1912
BRIEF [O.A.] Neumann, Carl W... Author: Neumann, Carl W... Recipient: Haeckel, Ernst Dating: 31.12.1913
BRIEF [O.A.] Neumann, Carl W... Author: Neumann, Carl W... Recipient: Haeckel, Ernst Corporation: Reclams Universum Dating: 03.04.1914
BRIEF [O.A.] Neumann, Carl W... Author: Neumann, Carl W... Recipient: Haeckel, Ernst Corporation: Reclams Universum Dating: 20.04.1914
BRIEF [O.A.] Neumann, Carl W... Author: Neumann, Carl W... Recipient: Haeckel, Ernst Dating: 13.12.1914
BRIEF [O.A.] Neumann, Carl W... Author: Neumann, Carl W... Recipient: Haeckel, Ernst Dating: 25.12.1915