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Bernhart, Rollie (October 3, 1960). "Urschel's Lab 50 Years Old". The Vidette-Messenger. Archived from the original on January 6, 2017. Retrieved January 5, 2017.
Henrichs, Karl D. (September 28, 1957). "Merchant Police Plan Under Study". The Vidette-Messenger. Archived from the original on January 6, 2017. Retrieved January 5, 2017.
"Data Firm Plans Changes". The Vidette-Messenger. January 25, 1974. Archived from the original on January 6, 2017. Retrieved January 5, 2017.
"To Build Luxury Housing". The Vidette-Messenger. January 25, 1974. Archived from the original on January 6, 2017. Retrieved January 5, 2017.
nwitimes.com
Earnshaw, Rob (July 11, 2013). "Urschel breaks new ground". The Times of Northwest Indiana. Archived from the original on September 5, 2015. Retrieved January 5, 2017.
"Urschel Laboratories Inc". The Vidette-Messenger. October 11, 1966. Archived from the original on January 6, 2017. Retrieved January 5, 2017.
Bernhart, Rollie (October 3, 1960). "Urschel's Lab 50 Years Old". The Vidette-Messenger. Archived from the original on January 6, 2017. Retrieved January 5, 2017.
Henrichs, Karl D. (September 28, 1957). "Merchant Police Plan Under Study". The Vidette-Messenger. Archived from the original on January 6, 2017. Retrieved January 5, 2017.
Earnshaw, Rob (July 11, 2013). "Urschel breaks new ground". The Times of Northwest Indiana. Archived from the original on September 5, 2015. Retrieved January 5, 2017.