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 while two more external campuses are also part of the School, the External Complex of Tacuba (Conjunto Externo de Tacuba), in Tacuba, west Mexico City, and the Sisal Foreign Station (Estación Foránea de Sisal), in Sisal, Mérida, Yucatan, south-east Mexico. The institution also offers graduate level studies (Master and Doctorate) in diverse areas: In addition, the School offers several Lifelong Learning programs as well as a wide range of training certificates. The UNAM also has the Institute of Chemistry (Instituto de Química). In the early 20th century, the mexican industry was strongly focused on beer brewing, mining, sugar processing, fabric