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Considerations about the occurrence of pollen grains of the Valeriana eichleriana (C. A. Muller) Graebner, in sediments of the Upper Quaternary in the state of Rio Grande do Sul, Brazil
Paulo C.P.Neves;Soraia G.Bauermann;Maria G.Rossoni;Jose R.R.Coiro;Marleni M.Toigo;Abdul R.Ashraf
Global Geology . 2004, (1): 1 -7 .