BRIEF [O.A.] Ritter, Paul von Author: Ritter, Paul von Recipient: Haeckel, Elisabeth Dating: 15.03.1891
BRIEF OHNE UMSCHLAG Haeckel, Ernst Author: Haeckel, Ernst Recipient: Haeckel, Elisabeth Dating: 09.01.1911
BRIEF OHNE UMSCHLAG Haeckel, Ernst Author: Haeckel, Ernst Recipient: Haeckel, Elisabeth Dating: 26.04.1919
BRIEF OHNE UMSCHLAG Haeckel, Ernst Author: Haeckel, Ernst Recipient: Haeckel, Elisabeth Dating: 09.01.1919
BRIEF OHNE UMSCHLAG Haeckel, Ernst Author: Haeckel, Ernst Recipient: Haeckel, Elisabeth Dating: 20.08.1917
BRIEF OHNE UMSCHLAG Haeckel, Ernst Author: Haeckel, Ernst Recipient: Haeckel, Elisabeth Dating: 16.01.1915
BRIEF OHNE UMSCHLAG Haeckel, Ernst Author: Haeckel, Ernst Recipient: Haeckel, Elisabeth Dating: 01.08.1914
BRIEF OHNE UMSCHLAG Haeckel, Agnes Author: Haeckel, Agnes Recipient: Haeckel, Elisabeth Dating: 23.02.1914
BRIEF [O.A.] Hintze, Wilhelmine Author: Hintze, Wilhelmine Recipient: Haeckel, Elisabeth Dating: 02.05.1915
BRIEF [O.A.] Semon, Richard W... Author: Semon, Richard W... Recipient: Haeckel, Elisabeth Dating: 22.04.1915