Γουόκερ πρώτος = George P.L.   Συγγραφείς = Edgardo Cañón-Tapia, & Emilio Herrero-Bervera
  Title = Origin of vesicle layering and double impritation by incentral grown in the Birkett basealt flow Columbia water plateau - Journal of Volcanology and Geotheral Research - volume = 88........................................................................................................................................................................................................................... 
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