Nichols, R.L. Installation of Water Flux Meters to Measure the Temporal Variation in Water Flux Through the Vadose Zone, report, January 15, 2003; (https://digital.library.unt.edu/ark:/67531/metadc734335/m1/1/: accessed November 17, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; .