BRIEF OHNE UMSCHLAG Falke, Johann Ernst Ludwig Author: Falke, Johann Ernst Ludwig Recipient: Haeckel, Ernst
BRIEF OHNE UMSCHLAG Haeckel, Elisabeth Author: Haeckel, Elisabeth Recipient: Haeckel, Charlotte Dating: 13.04.1882
WIDMUNG Haeckel, Ernst Author: Haeckel, Ernst Recipient: Lubosch, Wilhelm Dating: 1918.??.?? [Frühjahr]