Ships Cover for Admiralty Department of Works dredgers of various types (1927-1960). The documentation comprises details of individual vessels, stability calculations, trials reports, some details of peacetime paint schemes [post-War], requirements and specifications for new vessels, correspondence with contractors and details of tenders. The earliest papers date from March 1927 and the last from August 1960. This Cover comprises both this and a separate volume, also numbered 170A.