Arch Coal Inc (ACI) Maintains the Ranking.
Arch Coal, Inc. (NYSE: ACI) earns fourth Consecutive InformationWeek 500 Ranking for its business technology, the annual listing of the nation's most innovative users of business technology, as announced on September 14, 2009
Arch Coal is the only coal producer and one of only five natural resources companies among this year's InformationWeek 500.
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