Records of Humber Conservancy and the Humber Ports (Records deposited by Associated British Ports and its Predecessors) > Dock Engineering Records > Hull Joint Dock Committee: Correspondence with Messrs. S. Pearson and Son Limited in connection with Contract No. 1 > Papers No. 25/11 'Hull Joint Dock Contract No. 1—Messrs. S. Pearson & Son Ltd: Entrance lock'