This map of Maryland appeared in General Atlas for Carey’s Edition of Guthrie’s Geography Improved, published in Philadelphia in 1795. The map extends from the Delaware Bay westward to northeastern Virginia and indicates the state’s principal towns, roads, and counties, as well as mountains, rivers, and the bordering states of New Jersey, Pennsylvania, Delaware, and Virginia. It shows the following counties: Anne Arundel (spelled “Ann Arundel” on the map), Baltimore, Calvert, Caroline, Cecil, Dorchester, Frederick (“Frederic”), Harford, Kent, Montgomery, Prince George’s (“Prince George”), Queen Anne’s (“Queen Ann’s”), Saint Mary’s, Somerset, Talbot, Washington, and Worcester. Allegany County, formed in 1789 from the western part of Washington County, is missing. The map was engraved by William Barker (active 1795‒1803). Samuel Lewis (1753 or 1754‒1822), a Philadelphia draftsman, included an inset entitled “Continuation of the Potowmac River, from Fort Cumberland” that portrays the continuation of the Potomac into Western Maryland. The City of Washington and Baltimore appear as clusters of black markings. Mathew Carey (1760‒1839) was an immigrant from Ireland who worked as a publisher in Philadelphia, specializing in maps, atlases, and other geographical works. In 1795 he issued the first atlas published in the United States, the American Atlas. Early American publishers such as Carey were not restricted by international copyright agreements, and reused European sources to print extensive atlases and texts. Carey combined William Guthrie’s European maps, originally published in London after 1770, with updated maps of the United States, such as the Maryland map presented here, to produce Guthrie’s Geography Improved. The map is from the Rochambeau Collection at the Library of Congress, which consists of 40 manuscript maps, 26 printed maps, and a manuscript atlas that belonged to Jean-Baptiste-Donatien de Vimeur, comte de Rochambeau (1725‒1807), commander in chief of the French expeditionary army (1780‒82) during the American Revolution. Some of the maps were used by Rochambeau during the war. Dating from 1717 to 1795, the maps cover much of eastern North America, from Newfoundland and Labrador in the north to Haiti in the south. The collection includes maps of cities, maps showing Revolutionary War battles and military campaigns, and early state maps from the 1790s.