BRIEF OHNE UMSCHLAG Daelen, Eduard Author: Daelen, Eduard Recipient: Haeckel, Ernst Dating: 08.11.1916
BRIEF OHNE UMSCHLAG Daelen, Eduard Author: Daelen, Eduard Recipient: Haeckel, Ernst Dating: 29.12.1916
BRIEF OHNE UMSCHLAG Daelen, Eduard Author: Daelen, Eduard Recipient: Haeckel, Ernst Dating: 03.03.1916