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pdsi(27)
drought(11)
spei(5)
spi(5)
enso(4)
palmer drought severity index (pdsi)(4)
central asia(3)
climate change(3)
arctic oscillation(2)
cclm(2)
cfsr dataset(2)
climate(2)
cmip5(2)
dendrochronology(2)
dry and wet(2)
fire history(2)
global warming(2)
ndvi(2)
precipitation(2)
principal components analysis (pca)(2)
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