Rodríguez-Chaves, Daniela, et al. “ASSESSMENT OF HYDROCARBON LEVELS IN MARINE SEDIMENTS COLLECTED FROM THE GULF OF NICOYA REGION LOCATED BETWEEN PUNTA MORALES AND COSTA DE PAJAROS AND THEIR POSSIBLE ORIGIN (BIOGENIC ANTHROPOGENIC)”. Revista Geográfica De América Central., vol. 2, no. 53, May 2015, pp. 113-34, https://doi.org/10.15359/rgac.2-53.5.