Showing survey staff at work in the bush. The typewritten caption on the reverse reads 'Every inch of the Anchau corridor had to be surveyed by the Sleeping Sickness Service before the Anchau resettlement scheme could start. Over large areas vegetation surveys were carried out to determine the quality and amount of land suitable for resettlement. The distribution of tsetse fly, sleeping sickness and population had to be plotted and trial shafts sunk for water'.