BRIEF [O.A.] Flothuis, M... H... Author: Flothuis, M... H... Recipient: Haeckel, Ernst Dating: 07.01.1913
BRIEF [O.A.] Flothuis, M... H... Author: Flothuis, M... H... Recipient: Haeckel, Ernst Dating: 17.01.1913
BRIEF [O.A.] Flothuis, M... H... Author: Flothuis, M... H... Recipient: Haeckel, Ernst Dating: 14.02.1913
POSTKARTE Flothuis, M... H... Author: Flothuis, M... H... Recipient: Haeckel, Ernst Dating: 15.06.1913
BRIEF [O.A.] Flothuis, M... H... Author: Flothuis, M... H... Recipient: Haeckel, Ernst Dating: 05.07.1913
BRIEF [O.A.] Flothuis, M... H... Author: Flothuis, M... H... Recipient: Haeckel, Ernst Dating: 15.07.1913
POSTKARTE Flothuis, M... H... Author: Flothuis, M... H... Recipient: Haeckel, Ernst Dating: 29.07.1913
PORTRÄTPOSTKARTE Flothuis, M... H... Author: Flothuis, M... H... Recipient: Haeckel, Ernst Dating: 05.08.1913
BRIEF [O.A.] Flothuis, M... H... Author: Flothuis, M... H... Recipient: Haeckel, Ernst Dating: 30.12.1913
BRIEF [O.A.] Cats, Martin W... Author: Cats, Martin W... Recipient: Haeckel, Ernst Dating: 04.02.1913