Calvin J. Heusser, Jorge Rabassa, Aldo Brandani, Robert Stuckenrath, Late-Holocene Vegetation of the Andean Araucaria Region, Province of Neuquén, Argentina, Mountain Research and Development, Vol. 8, No. 1 (Feb., 1988), pp. 53-63
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Heusser et al. (1988) studied this question.
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