Green, William B., and Ellen B. Peffley. “Effects of Tractor Traffic and Soil Moisture Tension on Yield of Norgold Russet ’M’ Potatoes”. Texas Journal of Agriculture and Natural Resources 5 (November 10, 2016): 21–26. Accessed June 4, 2026. https://txjanr.agintexas.org/index.php/txjanr/article/view/304.