User:Smith609/Refs


 * User:Verisimlus/CX/Timeline


 * User:Verisimilus/Refs/Oxygen and Evolution - Berner, 2007


 * User:Verisimilus/Refs/Canfield et al 2007 -


 * User:Verisimilus/Refs/Kurland et al 2006 -


 * User:Verisimilus/Refs/Martin et al 2007