BRIEFABSCHRIFT Haeckel, Ernst Author: Haeckel, Ernst Recipient: Scheffauer, Herman Dating: 09.07.1911
BRIEF OHNE UMSCHLAG Haeckel, Ernst Author: Haeckel, Ernst Recipient: Scheffauer, Herman Dating: 25.03.1915
BRIEFABSCHRIFT Haeckel, Ernst Author: Haeckel, Ernst Recipient: Scheffauer, Herman Dating: 12.08.1913
BRIEFABSCHRIFT Haeckel, Ernst Author: Haeckel, Ernst Recipient: Scheffauer, Herman Dating: 18.05.1913
BRIEFABSCHRIFT Haeckel, Ernst Author: Haeckel, Ernst Recipient: Scheffauer, Herman Dating: 24.10.1912
BRIEFABSCHRIFT Haeckel, Ernst Author: Haeckel, Ernst Recipient: Scheffauer, Herman Dating: 19.09.1912
BRIEFABSCHRIFT Haeckel, Ernst Author: Haeckel, Ernst Recipient: Scheffauer, Herman Dating: 28.08.1912
BRIEFABSCHRIFT Haeckel, Ernst Author: Haeckel, Ernst Recipient: Scheffauer, Herman Dating: 12.04.1911