BRIEF OHNE UMSCHLAG Rohlfs, Gerhard Author: Rohlfs, Gerhard Recipient: Haeckel, Ernst Dating: 21.08.1873
BRIEF [O.A.] Marshall, William Author: Marshall, William Recipient: Haeckel, Ernst Dating: 03.01.1873
BRIEF [O.A.] Marshall, William Author: Marshall, William Recipient: Haeckel, Ernst Dating: 25.12.1873
BRIEF OHNE UMSCHLAG Rohlfs, Gerhard Author: Rohlfs, Gerhard Recipient: Haeckel, Ernst Dating: 19.08.1873
BRIEF [O.A.] Riecke, C... F... Author: Riecke, C... F... Recipient: Haeckel, Ernst Dating: 03.07.1873