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Calvert, W.H., Zuchowski, W. and Brower, L.P. 1982. The impact of forest thinning on microclimate in monarch butterfly (Danaus pexippus L.) overwintering areas of Mexico. Botanical Sciences. 42 (Aug. 1982), 11 - 18. DOI:https://doi.org/10.17129/botsci.1257.