Kothari, Kiran M. & PIttard, Gerard T. Sealing Large-Diameter Cast-Iron Pipe Joints Under Live Conditions, report, December 1, 2005; (https://digital.library.unt.edu/ark:/67531/metadc886446/m1/1/: accessed October 16, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; .