New petrified calamitaleans from the Permian of the Parnaíba Basin, central-north Brazil. Part I

Abstract
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Keywords
Funding Information
  • Roberto Iannuzzi (483704/2010-5, 309211/2013-1)
  • Conselho Nacional de Desenvolvimento Científico e Tecnológico” of Brazil (141365/2008-0)
  • German Science Foundation (RO 1273/3-1)