BRIEF OHNE UMSCHLAG Haeckel, Ernst Author: Haeckel, Ernst Recipient: Hilger, Luise Dating: 14.07.1919
POSTKARTE Kammerer, Paul Author: Kammerer, Paul Recipient: Hilger, Luise Corporation: Biologische Versuchsanstalt Wien Dating: 30.11.1913
BRIEF OHNE UMSCHLAG Haeckel, Ernst Author: Haeckel, Ernst Recipient: Hilger, Luise Dating: 13.09.1913
BRIEF OHNE UMSCHLAG Haeckel, Ernst Author: Haeckel, Ernst Recipient: Hilger, Luise Dating: 10.01.1917
BRIEF OHNE UMSCHLAG Haeckel, Ernst Author: Haeckel, Ernst Recipient: Hilger, Luise Dating: 30.10.1917
BRIEF OHNE UMSCHLAG Haeckel, Ernst Author: Haeckel, Ernst Recipient: Hilger, Luise Dating: 06.01.1916