David Livingstone Missionary Work By Cadymorrison2020 Period: Nov 20, 1840 to Mar 14, 1841 David Livingstone Missionary Work http://www.bbc.co.uk/history/historic_figures/livingstone_david.shtml#:~:text=Livingstone%20became%20convinced%20of%20his,sighting%20the%20upper%20Zambezi%20River.