BRIEF OHNE UMSCHLAG Thomson, Arthur John Author: Thomson, Arthur John Recipient: Haeckel, Ernst Dating: 10.07.1890
BRIEF OHNE UMSCHLAG Thomson, Arthur John Author: Thomson, Arthur John Recipient: Haeckel, Ernst Dating: 21.07.1890
BRIEF OHNE UMSCHLAG Thomson, Arthur John Author: Thomson, Arthur John Recipient: Haeckel, Ernst Dating: 22.12.1896
BRIEF OHNE UMSCHLAG Thomson, Arthur John Author: Thomson, Arthur John Recipient: Haeckel, Ernst Corporation: Natural History Department; University of Aberdeen Dating: 31.05.1899
BRIEF OHNE UMSCHLAG Thomson, Arthur John Author: Thomson, Arthur John Recipient: Haeckel, Ernst Dating: 25.01.1899