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Oxlade,C.[2011].101 things you should know about Volcanos.
Dickson,J.[2013]. The big book of Dinosaurs.NY: Octopus Publishing Group.
Linsay,W.[1994]. Prehistoric Life.NY: DK Publishing.
Newland.S.[2013]. Extinction!NY: Crabtree Publishing Company.
Oxlade,C.[2011].101 things you should know about Volcanos.