Records of Humber Conservancy and the Humber Ports (Records deposited by Associated British Ports and its Predecessors) > Humber Conservancy > Humber Conservancy Board: Technical drawings of Buoys, Launches, Lightvessels and other ships submitted to the Board by Manufactures and related papers > Humber Conservancy Board: Navigation Beacons, Buoys, and Floats > J. 1289A 'Humber Conservancy Board: Conical Superstructure'