1. Recent volcanicity at Taupo, New Zealand;Baumgart,1956
2. Plinian eruptions of Nevado de Toluca volcano, Mexico;Bloomfield;Geol. Rundsch.,1977
3. The Minoan eruption of Santorim, Greece;Bond;J. Geol. Soc. London,1976
4. The Granadilla pumice deposit of southern Tenerife, Canary Islands;Booth,1973
5. Products of explosive volcanism on Tenerife, Canary Islands;Booth,1980