SAYER, Robert, and John BENNET[publishers]. The American Military Pocket Atlas; Being An Approved Collection of Correct Maps, Both General and Particular, of the British Colonies; Especially Those Which Now Are, or Probably May Be the Theatre of War: Taken Principally From the Actual Surveys and Judicious Observations of Engineers...And Other Officers Employed in His Majesty's Fleets and Armies. London: Printed for R. Sayer and J. Bennet, . Titlepage, 2pp. dedication to "Gov. Pownall," 2pp. "Advertisement," 1p. "List of maps," and six engraved maps, handcolored in outline. Contemporary marbled boards; rebacked to style with modern calf, gilt leather label. Boards worn. Maps with some light foxing and soiling. Light wear at edges and folds, slight separation at some folds. Map 2 with a split along length of one vertical fold. About very good. The "Holster Atlas": one of the most important atlases of the American Revolution, designed for use in the field. The "Holster Atlas" was issued at the suggestion of Governor George Pownall and included the "maps that the British high command regarded as providing essential topographical information in the most convenient form" (Schwartz & Ehrenberg). This collection of maps was published by Sayer and Bennet at the beginning of the Revolution for the use of British officers. "Surveys and Topographical Charts being fit only for a Library, such maps as an Officer may take with him into the Field have been much wanted. The following Collection forms a Portable Atlas of North America, calculated in its Bulk and Price to suit the Pockets of Officers of all Ranks" (Advertisement). Although the publishers claimed the atlas would fit into an officer's pocket, it was more usually carried in a holster and thus gained its nickname. The atlas was generally bound in an octavo format, as is the case in this copy. The six maps are as follows: 1) Dunn, Samuel: NORTH AMERICA, AS DIVIDED AMONGST THE EUROPEAN POWERS. BY SAMUEL DUNN, MATHEMATICIAN. London: printed for Robt. Sayer, Jan. 10, 1774. Engraved map, handcolored in outline (13? x 18? inches). Engraved for Dunn's A NEW ATLAS (London, 1774). 2) Dunn, Samuel A COMPLEAT MAP OF THE WEST INDIES, CONTAINING THE COASTS OF FLORIDA, LOUISIANA, NEW SPAIN, AND TERRA FIRMA: WITH ALL THE ISLANDS. London: Robt. S.