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http://tobaccodocuments.org/mayo_clinic/501636597-6604.html

As a Footnote

Colby, Frank G. "RE: Trip Report on the 'Fifth International Symposium on the Prevention and Detection of Cancer' - Sao Paulo/Brazil, May 16-22, 1982.". 10 Jun 1982. Bates: 501636597-501636604.
http://tobaccodocuments.org/mayo_clinic/501636597-6604.html