BRIEF OHNE UMSCHLAG Haeckel, Ernst Author: Haeckel, Ernst Recipient: Linck, Gottlob Dating: 31.01.1913
BRIEF [O.A.] Recipient: Haeckel, Ernst Corporation: Veit & Comp. Verlagsbuchhandlung Dating: 10.05.1913
BRIEF [O.A.] Vieira, Augusto José Author: Vieira, Augusto José Recipient: Haeckel, Ernst Corporation: Commissao de Propaganda Dating: 15.02.1913
BRIEF [O.A.] Vieira, Augusto José Author: Vieira, Augusto José Recipient: Haeckel, Ernst Corporation: Commissao de Propaganda Dating: 18.03.1913
TELEGRAMM Thoden van Velzen, S... K... Author: Thoden van Velzen, S... K... Recipient: Haeckel, Ernst Dating: 16.02.1913
BRIEF [O.A.] Thoden van Velzen, S... K... Author: Thoden van Velzen, S... K... Recipient: Haeckel, Ernst Dating: 02.01.1913
BRIEF [O.A.] Thoden van Velzen, S... K... Author: Thoden van Velzen, S... K... Recipient: Haeckel, Ernst Dating: 31.03.1913
POSTKARTE Thoden van Velzen, S... K... Author: Thoden van Velzen, S... K... Recipient: Haeckel, Ernst Dating: 11.05.1913
BRIEF [O.A.] Thoden van Velzen, S... K... Author: Thoden van Velzen, S... K... Recipient: Haeckel, Ernst Dating: 30.06.1913
POSTKARTE Thoden van Velzen, S... K... Author: Thoden van Velzen, S... K... Recipient: Haeckel, Ernst Dating: 09.07.1913