Central Library (UNAM) based on the mexica cosmogonical belief that the shape of the universe is composed of two joined ellipses. This one features Tlaloc glyphs related to tonalpohualli, the most important ritual calendar of the mexica people. Said calendar was the center of their celebrations and their astronomical calculations. The finishing stroke to this side of the mural is an image of the myth concerning the founding of the city of Mexico-Tenochtitlan. Central Library (UNAM) The Central Library of the National Autonomous University of Mexico (UNAM), is the main library in the Ciudad Universitaria Campus. It holds one of the largest collections
School of Chemistry, UNAM and textile manufacturing and some pharmaceutical industries. However, the harsh national and international context, derived from the mexican revolution movement and the World War I affected the availability of highly skilled personnel. Therefore, in January 1913, Juan Salvador Agraz presented an initiative to the mexican president Francisco I. Madero to create the School of Chemistry. On September 23, 1916, the mexican president Venustiano Carranza promulgated by government-decree the foundation of the National School of Industrial Chemistry (Escuela Nacional de Química Industrial, and later Escuela Nacional de Ciencias Químicas or National School of Chemical Sciences) in the town of Tacuba (north-west