BRIEF OHNE UMSCHLAG Scheffauer, Herman Author: Scheffauer, Herman Recipient: Haeckel, Ernst Dating: 31.03.1914
BRIEF OHNE UMSCHLAG Scheffauer, Herman Author: Scheffauer, Herman Recipient: Haeckel, Ernst Dating: 17.04.1914
BRIEF OHNE UMSCHLAG Abbott, George Author: Abbott, George Recipient: Haeckel, Ernst Dating: 01.05.1914
BRIEF [O.A.] Holtorp, Oscar J... von Author: Holtorp, Oscar J... von Recipient: Haeckel, Ernst Dating: 14.02.1914
BRIEF OHNE UMSCHLAG Rottenburg, Paul von Author: Rottenburg, Paul von Recipient: Haeckel, Ernst Dating: 18.06.1914
POSTKARTE Rottenburg, Paul von Author: Rottenburg, Paul von Recipient: Haeckel, Ernst Dating: 12.03.1914
BRIEF [O.A.] Hole, E... S... Author: Hole, E... S... Recipient: Haeckel, Ernst Corporation: The Review of Reviews Dating: 18.04.1914
BRIEF OHNE UMSCHLAG Watts, Charles A. Author: Watts, Charles A. Recipient: Haeckel, Ernst Corporation: The Rationalist Press Association Dating: 03.04.1914
BRIEF [O.A.] Orton, Louis J... Author: Orton, Louis J... Recipient: Haeckel, Ernst Dating: ??.04.1914