Permian Basin Royalty Trust, an express trust, holds overriding royalty interests in various oil and gas properties in the United States. The company owns a 75% net overriding royalty interest in the Waddell Ranch properties comprising Dune, Sand Hills (Judkins), Sand Hills (McKnight), Sand Hills (Tubb), University-Waddell (Devonian), and Waddell fields located in Crane County, Texas. It also holds a 95% net overriding royalty in the Texas Royalty properties, which consist of various producing oil fields, such as Yates, Wasson, Sand Hills, East Texas, Kelly-Snyder, Panhandle Regular, N.