Geodetic work in Mexico from May, 1951, to March, 1952

Special attention has been given to the completion of the observations connected with the tieing-in of Mexican-Central America triangulation across the frontier between this country and Guatemala. Figure 1 shows the progress of the operations up to the first days of April, 1952. The unbroken lines represent sides already determined, and the dotted lines are sides in progress in April, 1952. This triangulation starts from the Yucuyacua-Gavilan side of the triangulation along the 98° meridian and extends to the Tacana-Monte Limar side of the Guatemalan triangulation. It consists of 17 figures and 48 stations, of which 37 have been completed and 11 are being observed.