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.As a result of collaboration with the National Maritime Museum, the publication of this monumental work in a superbly produced multi-volume edition that captures all thequalities of the original. Every page is reproduced at full size, making the extensive handwritten annotation readable, while the fine-line drawings retain all the colors thatPerkins used to denote appearance differences and alterations.The sixth volume of the series covers all submarines up to 1939, the diverse types of gunboat (from masted gun vessels through coastal `flat-irons' to river patrol craft), and sloops of various descriptions-small masted cruisers, convoy and minesweeping sloops of the Great War era, and interwar escort vessels.