BRIEF [O.A.] Giard, Alfred Author: Giard, Alfred Recipient: Haeckel, Ernst Corporation: Sorbonne facultè des Sciences, Laboratoire de Zoologie Maritime de Wimereux (Pas-de Calais) Dating: 02.03.1889
BRIEF OHNE UMSCHLAG Rottenburg, Paul von Author: Rottenburg, Paul von Recipient: Haeckel, Ernst Dating: 21.06.1889
BRIEF [O.A.] Mary, J... Author: Mary, J... Recipient: Haeckel, Ernst Corporation: L`Encyclopédie Contempororaine Dating: 06.06.1889
BRIEF [O.A.] Perrier, Edmond Author: Perrier, Edmond Recipient: Haeckel, Ernst Corporation: Muséum d`Historie Naturelle Dating: 24.03.1889