Records of Humber Conservancy and the Humber Ports (Records deposited by Associated British Ports and its Predecessors) > Humber Conservancy > Board of Trade Enqury into the Humber Conservancy Dredging Scheme: Deposit of Dredgings from the Hebble Shoal > Humber Conservancy Board: Specification of work to be performed in the Dredging of the Hebble Shoal, near Hull