This map uses an equidistant azimuthal projection. This type of projection consists in defining a central point and represent each point of the map at a correct proportional distance from the defined center. This map is centered in Buenos Aires.
Geographical Atlas of the Argentine Republic
This is the second edition of the maps that were published in 1887 in a geographical atlas of the argentine republic. It contains maps of every provincia of Argentina and a map of Buenos Aires.