Walker    first  George PL    coauthors    Edgardo CanTapia  Emilio HerreroBervera    title  Origin of vesicle layering and double imbrication by endogenous growth in the Birkett basalt flow Columbia river plateau    journal  Journal of Volcanology and Geothermal Research      volume     issue     pages     publisher     date     url     jstor      issn     doi     id     accessdate   August    Cite journal   last