POSTKARTE Osborn, Henry Fairfield Author: Osborn, Henry Fairfield Recipient: Haeckel, Ernst Dating: ??.??.1906
BRIEF OHNE UMSCHLAG Osborn, Henry Fairfield Author: Osborn, Henry Fairfield Recipient: Haeckel, Ernst Corporation: American Museum of Natural History Dating: 01.01.1910
BRIEF OHNE UMSCHLAG Osborn, Henry Fairfield Author: Osborn, Henry Fairfield Recipient: Haeckel, Ernst Corporation: American Museum of Natural History Dating: 20.12.1905
BRIEF OHNE UMSCHLAG Osborn, Henry Fairfield Author: Osborn, Henry Fairfield Recipient: Haeckel, Ernst Corporation: American Museum of Natural History Dating: 09.04.1906
TELEGRAMM Osborn, Henry Fairfield Author: Osborn, Henry Fairfield Recipient: Haeckel, Ernst Dating: 16.02.1914
BRIEF OHNE UMSCHLAG Osborn, Henry Fairfield Author: Osborn, Henry Fairfield Recipient: Plate, Ludwig Corporation: American Museum of Natural History Dating: 25.02.1909
BRIEF OHNE UMSCHLAG Osborn, Henry Fairfield Author: Osborn, Henry Fairfield Recipient: Haeckel, Ernst Corporation: American Museum of Natural History Dating: 12.08.1908