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
BRIEF OHNE UMSCHLAG Jaeger, Gustav Author: Jaeger, Gustav Recipient: Haeckel, Ernst Dating: 16.06.1873
BRIEF OHNE UMSCHLAG Jaeger, Gustav Author: Jaeger, Gustav Recipient: Haeckel, Ernst Dating: 22.01.1876