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Sentence Style
The Online Elements of Style
http://www.columbia.edu/acis/bartleby/strunk
Strunk and White's classic advice on usage and style.
What Is a Conjunction?
http://aix1.uottawa.ca/academic/arts/writcent/hypergrammar/conjunct.html
From the University of Ottawa's wonderful HyperGrammar comes this clear and thorough advice on using coordinating and subordinating conjunctions.