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Biography.com: Diogenes of Apollonia
http://search.biography.com/print_record.pl?id=8346
A brief biographical note on this Presocratic thinker.
Diogenes of Apollonia
http://www.utm.edu/research/iep/d/diogapol.htm
Brief article on this thinker, from the Internet Encyclopedia of Philosophy.
Diogenes of Apollonia
http://www.bartleby.com/65/di/DiogenesA.html
Brief article from the 2001 Columbia Encyclopedia.