BRIEF [O.A.] Fleischer, Richard Author: Fleischer, Richard Recipient: Haeckel, Ernst Dating: 04.11.1870
BRIEF [O.A.] Fleischer, Richard Author: Fleischer, Richard Recipient: Haeckel, Ernst Dating: 23.02.1871
BRIEF [O.A.] Fleischer, Richard Author: Fleischer, Richard Recipient: Haeckel, Ernst Dating: 29.04.1874
BRIEF [O.A.] Fleischer, Richard Author: Fleischer, Richard Recipient: Haeckel, Ernst Dating: 07.05.1874
BRIEF [O.A.] Fleischer, Richard Author: Fleischer, Richard Recipient: Haeckel, Ernst Dating: ??.??.1874
BRIEF [O.A.] Fleischer, Richard Author: Fleischer, Richard Recipient: Haeckel, Ernst Dating: 12.??.1875
BRIEF [O.A.] Fleischer, Richard Author: Fleischer, Richard Recipient: Haeckel, Ernst Corporation: Redaction der Bibliothek für Wissenschaft und Literatur Dating: 23.09.1875
BRIEF [O.A.] Fleischer, Richard Author: Fleischer, Richard Recipient: Haeckel, Ernst Dating: 11.??.1876
BRIEF [O.A.] Fleischer, Richard Author: Fleischer, Richard Recipient: Haeckel, Ernst Corporation: Redaction der Bibliothek für Wissenschaft und Literatur Dating: 19.08.1876
BRIEF [O.A.] Fleischer, Richard Author: Fleischer, Richard Recipient: Haeckel, Ernst Dating: 22.??.1877