BRIEF OHNE UMSCHLAG Gegenbaur, Carl Author: Gegenbaur, Carl Recipient: Haeckel, Ernst Dating: 18.10.1862
BRIEF OHNE UMSCHLAG Schubert, Adolph Author: Schubert, Adolph Recipient: Haeckel, Ernst Dating: 11.06.1862
BRIEF OHNE UMSCHLAG Schubert, Adolph Author: Schubert, Adolph Recipient: Haeckel, Ernst Dating: 10.08.1862
BRIEF OHNE UMSCHLAG Merkel, Carl August Author: Merkel, Carl August Recipient: Haeckel, Ernst Dating: 22.07.1862
BRIEF OHNE UMSCHLAG Merkel, Christiane Author: Merkel, Christiane Recipient: Haeckel, Ernst Dating: 15.08.1862
BRIEF OHNE UMSCHLAG Reimer, Georg Ernst Author: Reimer, Georg Ernst Recipient: Haeckel, Ernst Dating: 24.02.1862