BRIEF [O.A.] Bucchich, Gregorio Author: Bucchich, Gregorio Recipient: Haeckel, Ernst Dating: 14.02.1878
BRIEF [O.A.] Bucchich, Gregorio Author: Bucchich, Gregorio Recipient: Haeckel, Ernst Dating: 02.07.1878
BRIEF OHNE UMSCHLAG Finsterbusch, Ludwig Author: Finsterbusch, Ludwig Recipient: Haeckel, Ernst Dating: 24.11.1878
BRIEF [O.A.] Einstein, Leopold Author: Einstein, Leopold Recipient: Haeckel, Ernst Dating: 05.09.1878
BRIEF OHNE UMSCHLAG Engelmann, Wilhelm Author: Engelmann, Wilhelm Recipient: Haeckel, Ernst Corporation: Wilhelm Engelmann Verlagsbuchhandlung Dating: 27.06.1878
BRIEF [O.A.] Eichholtz, Alfred Author: Eichholtz, Alfred Recipient: Haeckel, Ernst Dating: 16.07.1878
BRIEF OHNE UMSCHLAG Engelmann, Wilhelm Author: Engelmann, Wilhelm Recipient: Haeckel, Ernst Corporation: Wilhelm Engelmann Verlagsbuchhandlung Dating: 16.07.1878
BRIEF [O.A.] Engelmann, Rudolf Author: Engelmann, Rudolf Recipient: Haeckel, Ernst Corporation: Wilhelm Engelmann Verlagsbuchhandlung Dating: 17.01.1878