BWWN/20/8
                                "Vale Royal Sluices. Operation of 1926-1935"
                            
                        
                            
                            Description
                                "Comparison of flood statistics, Vale Royal sluising", comparative graph and explanation note
                            
                        
                            
                            Date
                                1935
                            
                        
                            
                            Reference code
                                BWWN/20/8
                            
                        
                    