Guillermo González Beltrán, Ana Monge Sandí (Author) Recommendations for obtaining reliable results of resistance of concrete cylinders PDF (Spanish)
Jorge Salazar Delgado (Author) Guide for the Realization of Tests and Classification of Asphalt, Asphalt Emulsions and Asphalt Cutback According to the Central American Technical Regulation (RTCA 75.01.22: 047) PDF (Spanish)
Andrea Ulloa Calderón (Author) Guide to Laboratory Tests and Field Sampling for Quality Verification of Asphalt Pavement Materia PDF (Spanish)
