Scale approximately 1:875,000. 1 cm = approximately 8.75 kms. ; Lambert conformal conic projection (W 102°30ʹ--W 98°00ʹ/ N 24°30ʹ--N 21°00ʹ).
Relief shown by spot heights., Panel title., Publisher's no.: Mapa 23., and Index to cities and towns, inset of the city of San Luis Potosí , distance table, geographic data about the state, and col. ill. on verso.