BRIEF OHNE UMSCHLAG Haeckel, Ernst Author: Haeckel, Ernst Recipient: Allmers, Hermann Dating: 20.01.1860
BRIEF OHNE UMSCHLAG Hertwig, Oscar; Hertwig, Richard Author: Hertwig, Oscar; Hertwig, Richard Recipient: Haeckel, Ernst Dating: 16.01.1877
BRIEF OHNE UMSCHLAG Hertwig, Richard Author: Hertwig, Richard Recipient: Haeckel, Ernst Dating: 19.11.1876
BRIEF OHNE UMSCHLAG Hertwig, Richard Author: Hertwig, Richard Recipient: Haeckel, Ernst Dating: 07.01.1877
BRIEF OHNE UMSCHLAG Hertwig, Richard Author: Hertwig, Richard Recipient: Haeckel, Ernst Dating: 18.02.1877
BRIEF OHNE UMSCHLAG Hertwig, Richard Author: Hertwig, Richard Recipient: Haeckel, Ernst Dating: 11.03.1879
BRIEF OHNE UMSCHLAG Hertwig, Richard Author: Hertwig, Richard Recipient: Haeckel, Ernst Dating: 30.03.1877
TELEGRAMM Grassi, Giovanni Battista Author: Grassi, Giovanni Battista Recipient: Haeckel, Ernst Dating: 21.11.1911