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 Keferstein, Wilhelm Author: Keferstein, Wilhelm Recipient: Haeckel, Ernst Dating: 06.12.1862