BRIEF OHNE UMSCHLAG Ritter, Paul von Author: Ritter, Paul von Recipient: Haeckel, Ernst Dating: 25.03.1894
BRIEF OHNE UMSCHLAG Ritter, Paul von Author: Ritter, Paul von Recipient: Haeckel, Ernst Dating: 02.02.1891
BRIEF OHNE UMSCHLAG Haeckel, Ernst Author: Haeckel, Ernst Recipient: Haeckel, Agnes Dating: 26.08.1900
BRIEF OHNE UMSCHLAG Haeckel, Ernst Author: Haeckel, Ernst Recipient: Haeckel, Carl Gottlob; Haeckel, Charlotte Dating: 18.04.1867
BRIEF OHNE UMSCHLAG Haeckel, Ernst Author: Haeckel, Ernst Recipient: Haeckel, Charlotte Dating: 21.08.1878
BRIEF OHNE UMSCHLAG Haeckel, Ernst Author: Haeckel, Ernst Recipient: Haeckel, Agnes Dating: 30.08.1878
BRIEF OHNE UMSCHLAG Ritter, Paul von Author: Ritter, Paul von Recipient: Haeckel, Ernst Dating: 29.03.1894
BRIEF OHNE UMSCHLAG Quillet, Aristide Author: Quillet, Aristide Recipient: Haeckel, Ernst Dating: 18.12.1912