Stahle et al. 2011, Major Mesoamerican droughts of the past millennium, GRL 38; June PDSI reconstruction for central Mexico from Montezuma baldcypress at Barranca de Amealco, Queretaro, 771 to 2008, NOAA
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Queretaro bald cypress: the worst drought in 600 years ended in 1539; 1540 to 1580 was the wettest stretch