Ordóñez-Olivares , A. and Beita-Sandí, W. 2020. Physicochemical and isotopic (18O and 2H) characterization of the northern region of Tempisque aquifer, Costa Rica. UNED Research Journal. 12, 1 (Mar. 2020), e2588. DOI:https://doi.org/10.22458/urj.v12i1.2588.