POSTKARTE Klunzinger, Carl Benjamin Author: Klunzinger, Carl Benjamin Recipient: Haeckel, Ernst Dating: 09.03.1907
BRIEF [O.A.] Recipient: Haeckel, Ernst Corporation: Stregker & Schröder Verlagsbuchhandlung Dating: 11.02.1909
BRIEF [O.A.] Recipient: Haeckel, Ernst Corporation: Stregker & Schröder Verlagsbuchhandlung Dating: 10.03.1909
BRIEF [O.A.] Recipient: Haeckel, Ernst Corporation: Stregker & Schröder Verlagsbuchhandlung Dating: 03.12.1909
BRIEF OHNE UMSCHLAG Jaeger, Gustav Author: Jaeger, Gustav Recipient: Haeckel, Ernst Dating: 30.09.1868
BRIEF OHNE UMSCHLAG Jaeger, Gustav Author: Jaeger, Gustav Recipient: Haeckel, Ernst Dating: 16.02.1870
BRIEF OHNE UMSCHLAG Jaeger, Gustav Author: Jaeger, Gustav Recipient: Haeckel, Ernst Dating: 23.05.1872
BRIEF OHNE UMSCHLAG Jaeger, Gustav Author: Jaeger, Gustav Recipient: Haeckel, Ernst Dating: 28.02.1872
