The Richard Perkins warship identification albums form one of the most detailed studies ever undertaken of the changes to the appearance of Royal Navy ships. This final volume of the series reproduces all the remaining material from the Perkins albums, covering convoy and minesweeping sloops of the Great War era, interwar escorts, mine warfare vessels, and important naval auxiliaries such as survey ships, depot ships, and Admiralty tugs. It even includes the sketches and unfinished material that form an appendix to this mammoth undertaking.