BRIEF OHNE UMSCHLAG Keferstein, Wilhelm Author: Keferstein, Wilhelm Recipient: Haeckel, Ernst Dating: 10.06.1862
BRIEF OHNE UMSCHLAG Keferstein, Wilhelm Author: Keferstein, Wilhelm Recipient: Haeckel, Ernst Dating: 18.12.1862
BRIEF OHNE UMSCHLAG Krabbe, Harald Author: Krabbe, Harald Recipient: Haeckel, Ernst Dating: 15.07.1862
BRIEF OHNE UMSCHLAG Merkel, Carl August Author: Merkel, Carl August Recipient: Haeckel, Ernst Dating: 22.07.1862
BRIEF OHNE UMSCHLAG Merkel, Christiane Author: Merkel, Christiane Recipient: Haeckel, Ernst Dating: 15.08.1862