BRIEF OHNE UMSCHLAG Thomson, Arthur John Author: Thomson, Arthur John Recipient: Haeckel, Ernst Dating: 22.12.1896
BRIEF OHNE UMSCHLAG Bernard, Henry Author: Bernard, Henry Recipient: Haeckel, Ernst Dating: 23.11.1896
BRIEF OHNE UMSCHLAG Rottenburg, Paul Author: Rottenburg, Paul Recipient: Haeckel, Ernst Dating: 27.09.1896
BRIEF OHNE UMSCHLAG Rottenburg, Paul Author: Rottenburg, Paul Recipient: Haeckel, Ernst Dating: 23.12.1896