BRIEF [O.A.] Marshall, William Author: Marshall, William Recipient: Haeckel, Ernst Dating: 08.11.1872
BRIEF [O.A.] Martens, Eduard von Author: Martens, Eduard von Recipient: Haeckel, Ernst Dating: 12.01.1872
BRIEF [O.A.] Martens, Eduard von Author: Martens, Eduard von Recipient: Haeckel, Ernst Dating: 09.10.1872
BRIEF [O.A.] Koch, Eduard Author: Koch, Eduard Recipient: Haeckel, Ernst Corporation: E. Schweizerbart`sche Verlagsbuchhandlung, Eduard Koch Dating: 08.12.1872
BRIEF [O.A.] Alglave, Emile Author: Alglave, Emile Recipient: Haeckel, Ernst Corporation: Revue Politique et Littéraire, Revue Scientifique Dating: 20.04.1872