BRIEF OHNE UMSCHLAG Haeckel, Ernst Author: Haeckel, Ernst Recipient: Plate, Ludwig Dating: 26.01.1909
BRIEF OHNE UMSCHLAG Magnussen, Eleonore Author: Magnussen, Eleonore Recipient: Plate, Ludwig Dating: 03.07.1909
BRIEF OHNE UMSCHLAG Magnussen, Eleonore Author: Magnussen, Eleonore Recipient: Plate, Ludwig Dating: 08.07.1909
BRIEF OHNE UMSCHLAG Osborn, Henry Fairfield Author: Osborn, Henry Fairfield Recipient: Plate, Ludwig Corporation: American Museum of Natural History Dating: 25.02.1909