POSTKARTE Beregi, Oskar Author: Beregi, Oskar Recipient: Haeckel, Ernst Corporation: National Theater Dating: 15.01.1906
BRIEF [O.A.] Breuer, Cornel H... Author: Breuer, Cornel H... Recipient: Haeckel, Ernst Dating: 10.10.1904
BRIEF [O.A.] Breuer, Cornel H... Author: Breuer, Cornel H... Recipient: Haeckel, Ernst Dating: 16.10.1904
BRIEF [O.A.] Breuer, Cornel H... Author: Breuer, Cornel H... Recipient: Haeckel, Ernst Dating: 14.02.1905
TELEGRAMM Breuer, Cornel H... Author: Breuer, Cornel H... Recipient: Haeckel, Ernst Dating: 16.02.1908
BRIEF [O.A.] Breuer, Cornel H... Author: Breuer, Cornel H... Recipient: Haeckel, Ernst Dating: 06.03.1908