Interactive tree of Georg Friedrich Johannsen

George Thomas Blackett 1883–

Anne Jemima Mary Blackett 1886–

Colin Ross –

James Edmund Blackett 1887–1942

George Frederick Blackett 1895–

Minna Georgine Margaretha Johannsen 1858–1939

James Blackett 1857–1915

Georg Friedrich Johannsen –

Maria Albertine Dittmann 1834–1881