POSTKARTE Nippold, W... K... A... Author: Nippold, W... K... A... Recipient: Haeckel, Ernst Dating: ??.03.1908
BRIEF [O.A.] Nippold, W... K... A... Author: Nippold, W... K... A... Recipient: Haeckel, Ernst Dating: 08.02.1904
BRIEF [O.A.] Nippold, W... K... A... Author: Nippold, W... K... A... Recipient: Haeckel, Ernst Dating: 14.10.1903
BRIEF [O.A.] Nippold, W... K... A... Author: Nippold, W... K... A... Recipient: Haeckel, Ernst Dating: 23.10.1903