BRIEF [O.A.] Barnard, William Stebbins Author: Barnard, William Stebbins Recipient: Haeckel, Ernst Dating: 23.06.1874
BRIEF [O.A.] Auerbach, Leopold Author: Auerbach, Leopold Recipient: Haeckel, Ernst Dating: 18.01.1874
BRIEF [O.A.] Alglave, Emile Author: Alglave, Emile Recipient: Haeckel, Ernst Corporation: Revue Politique et Littéraire, Revue Scientifique Dating: 25.09.1874
BRIEF [O.A.] Agassiz, Alexander Author: Agassiz, Alexander Recipient: Haeckel, Ernst Corporation: Museum of Comparative Zoology, at Harvard College Dating: 28.01.1874