BRIEF OHNE UMSCHLAG Siebold, Carl Theodor Ernst von Author: Siebold, Carl Theodor Ernst von Recipient: Haeckel, Ernst Dating: 14.02.1875
BRIEF OHNE UMSCHLAG Siebold, Carl Theodor Ernst von Author: Siebold, Carl Theodor Ernst von Recipient: Haeckel, Ernst Dating: 04.03.1875
BRIEF OHNE UMSCHLAG Siebold, Carl Theodor Ernst von Author: Siebold, Carl Theodor Ernst von Recipient: Haeckel, Ernst Dating: 04.11.1875
BRIEF OHNE UMSCHLAG Haeckel, Ernst Author: Haeckel, Ernst Recipient: Haeckel, Charlotte Dating: 29.04.1875
BRIEF [O.A.] Gaugengigl, Ignaz Author: Gaugengigl, Ignaz Recipient: Haeckel, Ernst Dating: 16.05.1875