BRIEF [O.A.] Starck, Emilie Author: Starck, Emilie Recipient: Haeckel, Ernst Corporation: Vinola Wine Ranche
BRIEFABSCHRIFT Ritter, Paul von Author: Ritter, Paul von Recipient: Haeckel, Ernst Dating: 07.01.1886
BRIEF OHNE UMSCHLAG Harnier, Eduard von Author: Harnier, Eduard von Recipient: Haeckel, Ernst Dating: 30.05.1886