Stancil, Paul L. "DOT-111 Tank Car Design"(PDF). NTSB Office of Railroad, Pipeline and Hazardous Materials Safety. Archived from the original(PDF) on Nov 10, 2013.
Stancil, Paul L. "DOT-111 Tank Car Design"(PDF). NTSB Office of Railroad, Pipeline and Hazardous Materials Safety. Archived from the original(PDF) on Nov 10, 2013.