BRIEF [O.A.] Scherzer, Ritter Karl von Author: Scherzer, Ritter Karl von Recipient: Haeckel, Ernst Corporation: Ministerium für Handel und Volkswirthschaft Dating: 19.11.1869
BRIEF [O.A.] Scherzer, Ritter Karl von Author: Scherzer, Ritter Karl von Recipient: Haeckel, Ernst Dating: 18.12.1869
BRIEF [O.A.] Romberg, Heinrich Author: Romberg, Heinrich Recipient: Haeckel, Ernst Dating: 01.02.1869
