Knox Glass Bottle Company
The great majority of the company's production was in the form of glass bottles, many of which were beer bottles, milk bottles, and a large number of glass medicine bottles in a variety of standard sizes. Bottle collectors identify the company's products through the mould numbers and distinctive letter-in-a-keystone mark on the base of the bottles.  
The founder of the Knox Glass Bottle Company was Roy Underwood (1887−1951). During its operations, from 1917 to 1968, the company acquired 16 other glassmaking companies−plants in the United States. 
A lawusuit between the company and a former executive (Knox Glass Bottle Company v. Underwood, 89 So.2d 799 (Miss. 1956)) "was the first Mississippi Supreme Court case to define in detail the fiduciary duties of a corporate director and officer," according to a law firm that represented one of the parties. 
- SHA.org: History of the Knox Glass Bottle Company . accessed 20 November 2016.
- BLM.gov, Bottles and Extras: "Knox Glass and the Marks Toulouse Missed" (Winter 2004) — discusses the company history, and the T-in-a-keystone mark used by the company's Palestine, Texas plant.
- Palestine (Texas) Herald: "Knox Glass plant marker dedication planned Saturday" — discusses the Knox Glass Bottle Co. of Mississippi branch plant in Palestine, Texas (1941−1985) + Texas Historical Marker at site.
- Eccles-Lesher Memorial Library, Local and State History Books Collection: "March of Progress, 1775-1933" - section on the history of the Knox Glass Bottle Company, L. W. Hulings, 1933.
- Butlersnow.com: Knox Glass Bottle Company v. Underwood
- WCC.state.ct: Glass Container Corporation bankruptcy
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