BRIEF [O.A.] Ferguson, Campbell Author: Ferguson, Campbell Recipient: Haeckel, Ernst Dating: 10.07.1909
BRIEF [O.A.] Cossar, Robert A... Author: Cossar, Robert A... Recipient: Haeckel, Ernst Dating: 14.11.1901
POSTKARTE Clements, J... M... Author: Clements, J... M... Recipient: Haeckel, Ernst Dating: 16.02.1913
BRIEF OHNE UMSCHLAG Doubleday, H. S. Author: Doubleday, H. S. Recipient: Haeckel, Ernst Dating: 20.10.1907
BRIEF OHNE UMSCHLAG Doubleday, H. S. Author: Doubleday, H. S. Recipient: Haeckel, Ernst Dating: 22.03.1909
BRIEF [O.A.] Bibaud, J... J... E... Author: Bibaud, J... J... E... Recipient: Haeckel, Ernst Dating: 23.07.1911
BRIEF [O.A.] Bibaud, J... J... E... Author: Bibaud, J... J... E... Recipient: Haeckel, Ernst Dating: 14.09.1912
BRIEF [O.A.] Bibaud, J... J... E... Author: Bibaud, J... J... E... Recipient: Haeckel, Ernst Dating: 25.12.1914
BRIEF [O.A.] Macallum, A... B... Author: Macallum, A... B... Recipient: Haeckel, Ernst Corporation: British Association for the Advancement of Science Dating: 01.06.1897
BRIEF [O.A.] Moore, A... Bramlay Author: Moore, A... Bramlay Recipient: Haeckel, Ernst Corporation: The Northern Club Dating: 06.04.1914