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Directors and Officers | Koch Enterprises, Inc.
Koch family - Wikipedia
Robert Koch - Wikipedia
Bob Koch - Evansville Living Magazine
Bob Koch Profiles - Facebook
Robert Koch – Biographical - NobelPrize.org
Robert Koch - Biography
Celebrating 150 years of success: A Q&A with Robert Koch of Koch ...
Robert Koch | German Bacteriologist & Nobel Laureate
A New Leader | Koch Enterprises, Inc.