Records of Humber Conservancy and the Humber Ports (Records deposited by Associated British Ports and its Predecessors) > Humber Conservancy > Publications produced, or acquired by the Humber Conservancy Board > International Lighthouse Conference, 1929 > 1st International Lighthouse Conference, London, 1929: Principal developments in coast lights and fog signalling—Report by J. P. Bowen, M. Inst CE