BRIEF OHNE UMSCHLAG Krukenberg, Gustav Author: Krukenberg, Gustav Recipient: Haeckel, Ernst Dating: 13.11.1897
BRIEF OHNE UMSCHLAG Krukenberg, Gustav Author: Krukenberg, Gustav Recipient: Haeckel, Ernst Dating: 01.06.1868
BRIEF OHNE UMSCHLAG Merkel, August Author: Merkel, August Recipient: Haeckel, Ernst Dating: 28.12.1857
BRIEF OHNE UMSCHLAG Merkel, Carl August Author: Merkel, Carl August Recipient: Haeckel, Ernst Dating: 22.07.1862
BRIEF OHNE UMSCHLAG Merkel, August Author: Merkel, August Recipient: Haeckel, Charlotte Dating: 28.06.1863
BRIEF OHNE UMSCHLAG Merkel, August Author: Merkel, August Recipient: Haeckel, Ernst Dating: 11.11.1864
BRIEF OHNE UMSCHLAG Merkel, Christiane Author: Merkel, Christiane Recipient: Haeckel, Ernst Dating: 03.07.1867
BRIEF OHNE UMSCHLAG Merkel, August Author: Merkel, August Recipient: Haeckel, Ernst Dating: 28.06.1863
