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 > Reports on the Humber System produced by Humber Conservancy Board or third parties > Humber Conservancy Board: Memorandum relative to developments in Lighthouse Equipment, Fog-Signal Apparatus, etc., within the jurisdiction of the Board