BRIEF [O.A.] Smith, Balduin Michael Author: Smith, Balduin Michael Recipient: Haeckel, Ernst Dating: 08.06.1887
BRIEF OHNE UMSCHLAG Paul, C. Kegan Author: Paul, C. Kegan Recipient: Haeckel, Ernst Corporation: Kegan Paul, Trench & Co. Publishers Dating: 08.01.1887
BRIEF OHNE UMSCHLAG Paul, C. Kegan Author: Paul, C. Kegan Recipient: Haeckel, Ernst Corporation: Henry S. King & Co. Publishers Dating: 10.07.1887
BRIEF OHNE UMSCHLAG Paul, C. Kegan Author: Paul, C. Kegan Recipient: Haeckel, Ernst Dating: 01.10.1887