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...lopedia" /> In 1974, the 15th edition adopted a third goal: to systematise all human knowledge.<ref name="propedia_preface" /> The history of the ''Britan ...the world's most respected authorities in their fields. A general index of all articles was included for the first time in the 7th edition, a practice mai

...web |last=Krock|first=Lexi|title=The World on Fire|publisher=NOVA online - Public Broadcasting System (PBS)|accessdate=2009-07-13|date=June 2002|url=http://w ...s. While the causes of wildfires vary and the outcomes are always unique, all wildfires can be characterized in terms of their physical properties, their