BRIEF [O.A.] Korab', Valdemar C... de Author: Korab', Valdemar C... de Recipient: Haeckel, Ernst Dating: 20.12.1901
BRIEF [O.A.] Korab', Valdemar C... de Author: Korab', Valdemar C... de Recipient: Haeckel, Ernst Corporation: Instituto Moderno Dating: 26.09.1900
BRIEF OHNE UMSCHLAG Korab', Valdemar C... de Author: Korab', Valdemar C... de Recipient: Haeckel, Ernst Corporation: Instituto Moderno Dating: 14.06.1900
BRIEF [O.A.] Korab', Valdemar C... de Author: Korab', Valdemar C... de Recipient: Haeckel, Ernst Dating: 19.06.1902
BRIEF [O.A.] Korab', Valdemar C... de Author: Korab', Valdemar C... de Recipient: Haeckel, Ernst Dating: 14.01.1904
BRIEF [O.A.] Korab', Valdemar C... de Author: Korab', Valdemar C... de Recipient: Haeckel, Ernst Dating: 05.02.1905
BRIEF [O.A.] Korab', Valdemar C... de Author: Korab', Valdemar C... de Recipient: Haeckel, Ernst Dating: 15.09.1905
BRIEF [O.A.] Korab', Valdemar C... de Author: Korab', Valdemar C... de Recipient: Haeckel, Ernst Dating: 21.01.1906