TELEGRAMM Krauseneck, Gustav Adolf Author: Krauseneck, Gustav Adolf Recipient: Haeckel, Ernst Dating: 16.02.1904
TELEGRAMM Marchesetti, Carlo de Author: Marchesetti, Carlo de Recipient: Haeckel, Ernst Dating: 16.02.1904
BRIEF [O.A.] Marchesetti, Carlo de Author: Marchesetti, Carlo de Recipient: Haeckel, Ernst Corporation: Museo Civico di Storia Naturale Dating: 14.02.1904
BRIEF [O.A.] Krauseneck, Valentine Author: Krauseneck, Valentine Recipient: Haeckel, Ernst Dating: 12.02.1904
BRIEF [O.A.] Krauseneck, Valentine Author: Krauseneck, Valentine Recipient: Haeckel, Ernst Dating: 29.07.1904
POSTKARTE Krauseneck, Valentine Author: Krauseneck, Valentine Recipient: Haeckel, Ernst Dating: 30.12.1904
BRIEF OHNE UMSCHLAG Krauseneck, Gustav Adolf Author: Krauseneck, Gustav Adolf Recipient: Haeckel, Ernst Dating: 14.11.1904
BRIEF OHNE UMSCHLAG Krauseneck, Gustav Adolf Author: Krauseneck, Gustav Adolf Recipient: Haeckel, Ernst Dating: 31.12.1904