Reference:Stockmarr1974a
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Verbatim text: Stockmarr, J. 1974. SEM studies on pollen grains of North European Ulmus species. Grana 14: 103-107.
Author: Stockmarr, J.
Year: 1974
Title: SEM studies on pollen grains of North European Ulmus species
Journal: Grana
Volume: 14
Pages: 103–107