Records of W.H.H. Hutchinsons, ship owners and forwarding agents of Hull > Letters, memos and invoices to and from W.H.H. Hutchinsons & Sons of Hull regarding cargoes, delivery and transportation costs and other related matters > Letter to Messrs. W.H.H. Hutchinsons & Sons of Hull from the Humber & Steam Ship Owners Conference office in York regarding the division of traffic to Rotterdam