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Baumgartner-Mora, C.; O. Baumgartner, P.; Tschudin, P. Late Oligocene Larger Foraminifera From Nosara (Nicoya Península, Costa Rica) and Indward (Carriacou, Lesser Antilles), Calibrated by 87sr/ 86sr Isotope Stratigraphy. Rev. Geol. Amér. Central 2007, 38.