BRIEF OHNE UMSCHLAG Spencer, Herbert Author: Spencer, Herbert Recipient: Haeckel, Ernst Dating: 02.11.1895
BRIEF [O.A.] Recipient: Haeckel, Ernst Corporation: Society of Science, Letters and Art Dating: 30.03.1895
BRIEF OHNE UMSCHLAG Flower, William Henry Author: Flower, William Henry Recipient: Haeckel, Ernst Corporation: British Museum, Natural History Dating: 30.09.1895
POSTKARTE Bather, Francis Arthur Author: Bather, Francis Arthur Recipient: Haeckel, Ernst Corporation: British Museum, Natural History Dating: 30.12.1895
POSTKARTE Sclater, Philip L... Author: Sclater, Philip L... Recipient: Haeckel, Ernst Corporation: Zoological Society Dating: 07.10.1895