Petrography and Geochemistry of the Igneous Rocks from Eua, Tongan Islands Ewart, A. ; Bryan, W. B. Abstract Publication: Geological Society of America Bulletin Pub Date: 1972 DOI: 10.1130/0016-7606(1972)83[3281:PAGOTI]2.0.CO;2 Bibcode: 1972GSAB...83.3281E