BRIEF [O.A.] Rottenburg, Paul von Author: Rottenburg, Paul von Recipient: Haeckel, Ernst Dating: 28.07.1881
BRIEF [O.A.] Cunningham, D. J. Author: Cunningham, D. J. Recipient: Haeckel, Ernst Dating: 27.08.1881
BRIEF OHNE UMSCHLAG Aveling, Edward Bibbins Author: Aveling, Edward Bibbins Recipient: Haeckel, Ernst Corporation: Practical Science Laboratory Dating: 01.11.1881
BRIEF OHNE UMSCHLAG Darwin, Charles Author: Darwin, Charles Recipient: Haeckel, Ernst Dating: 09.02.1881
BRIEF OHNE UMSCHLAG Darwin, Charles Author: Darwin, Charles Recipient: Haeckel, Ernst Dating: 25.06.1881
BRIEF [O.A.] Bell, Francis Jeffrey Author: Bell, Francis Jeffrey Recipient: Haeckel, Ernst Corporation: British Museum (Natural History) Dating: 02.07.1881
BRIEF OHNE UMSCHLAG Murray, John Author: Murray, John Recipient: Haeckel, Ernst Corporation: Challenger Office Dating: 03.03.1881
BRIEF OHNE UMSCHLAG Murray, John Author: Murray, John Recipient: Haeckel, Ernst Corporation: Challenger Office Dating: 01.03.1881