Carlos de Chapeaurouge, 1846-1922, was a prominent mapmaker and surveyor in Argentina. He produced many of the earliest cadastral surveys of Argentine towns and provinces. In 1870 he mapped the unexplored Indian lands in northern Argentina and made the layout of agricultural colonies for the areas. He made the first official survey of Buenos Aires in 1888. His greatest work was this Plano Catastral de la Republica Argentina, published in 1901. He spent 12 years assembling the maps and the surveys. When issued it was an important resource for the State because of its detailed showing of properties and their boundaries and their owners. Sheets 82 and 113 were apparently not issued, they are missing in our copy and the copy online at the Library of Congress. We believe that our digital composite of all the map sheets into one large map, as Chapeaurouge intended, may be the first time this has been done.