BRIEF OHNE UMSCHLAG Althoff, Friedrich Theodor Author: Althoff, Friedrich Theodor Recipient: Haeckel, Ernst Dating: 25.10.1892
BRIEF OHNE UMSCHLAG Paetel, Elwin Author: Paetel, Elwin Recipient: Haeckel, Ernst Corporation: Verlagsbuchhandlung Gebrüder Paetel in Berlin Dating: 24.12.1892
BRIEF [O.A.] Zedlitz-Trütschler, von Author: Zedlitz-Trütschler, von Recipient: Haeckel, Ernst Dating: 04.03.1892
BRIEF [O.A.] Smith, Gordon Author: Smith, Gordon Recipient: Haeckel, Ernst Corporation: Reuters Telegram Co. Dating: 23.07.1892
BRIEF [O.A.] Smith, Gordon Author: Smith, Gordon Recipient: Haeckel, Ernst Corporation: Reuters Telegram Co. Dating: 25.07.1892
BRIEF [O.A.] Smith, Gordon Author: Smith, Gordon Recipient: Haeckel, Ernst Corporation: Reuters Telegram Co. Dating: 27.07.1892
BRIEF [O.A.] Smith, Gordon Author: Smith, Gordon Recipient: Haeckel, Ernst Corporation: Reuters Telegram Co. Dating: 28.07.1892