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Continue to ChatFive Questions: Frank Callanan, vice president of Geotechnology Inc. https://geoprac.net/2010/12/five-questions-frank-callanan-vice-president-of-geotechnology-inc/
Five Questions: Frank Callanan, vice president of Geotechnology Inc. https://geoprac.net/2010/12/five-questions-frank-callanan-vice-president-of-geotechnology-inc/