BRIEF OHNE UMSCHLAG Krupp, Margarethe Author: Krupp, Margarethe Recipient: Haeckel, Ernst Dating: 27.07.1908
BRIEF OHNE UMSCHLAG Krupp, Margarethe Author: Krupp, Margarethe Recipient: Haeckel, Ernst Dating: 02.12.1908
BRIEF OHNE UMSCHLAG Krupp, Margarethe Author: Krupp, Margarethe Recipient: Haeckel, Ernst Dating: 24.01.1908
BRIEFENTWURF Krupp, Margarethe Author: Krupp, Margarethe Recipient: Haeckel, Ernst Dating: 24.01.1908