Selected isotopic age determinations on Trans-Amazonian granitoids. 1993. In: The geology of the Guiana Shield. A. K. Gibbs and C. N. Barrow, Oxford Monographs on geology and geophysics, No. 22, 1993. My sincere gratitude to Professor Dr. Vincenzo Costanzo-Álvarez for kindly providing this reference. You can download complete PDF version at / Puedes bajar la versión completa en PDF en: https://mariantoc.github.io/igneous.html#AgeGranitoides1993