BRIEF OHNE UMSCHLAG McCabe, Joseph Author: McCabe, Joseph Recipient: Haeckel, Ernst Dating: 21.03.1906
BRIEF OHNE UMSCHLAG McCabe, Joseph Author: McCabe, Joseph Recipient: Haeckel, Ernst Dating: 05.09.1906
BRIEF OHNE UMSCHLAG McCabe, Joseph Author: McCabe, Joseph Recipient: Haeckel, Ernst Dating: 16.11.1906
BRIEF OHNE UMSCHLAG Osborn, Henry Fairfield Author: Osborn, Henry Fairfield Recipient: Haeckel, Ernst Corporation: American Museum of Natural History Dating: 09.04.1906
BRIEF OHNE UMSCHLAG Metze, Erich A. Author: Metze, Erich A. Recipient: Haeckel, Ernst Dating: 12.11.1906
BRIEF OHNE UMSCHLAG Thomas, Emil Author: Thomas, Emil Recipient: Haeckel, Ernst Corporation: Verlag der Allgemeinen Buchhändlerzeitung Dating: 17.02.1906
