BRIEF [O.A.] Blutharsche, Karl F... Author: Blutharsche, Karl F... Recipient: Haeckel, Ernst Dating: 24.04.1912
BRIEF [O.A.] Belford, Robert J... Author: Belford, Robert J... Recipient: Haeckel, Ernst Corporation: Typewriter Silencer Mfrs. Dating: 01.10.1912
BRIEF [O.A.] Belford, Robert J... Author: Belford, Robert J... Recipient: Haeckel, Ernst Corporation: Typewriter Silencer Mfrs. Dating: 25.03.1912
BRIEF [O.A.] Belford, Robert J. Author: Belford, Robert J. Recipient: Haeckel, Ernst Corporation: Typewriter Silencer Mfrs. Dating: 14.06.1912
BRIEF OHNE UMSCHLAG Belford, Robert J. Author: Belford, Robert J. Recipient: Haeckel, Ernst Corporation: Belford & Company Publishers Dating: 16.12.1912