1. Bailey, C. (2014). The saddest affair: A geologic perspective on the Battle of the Crater, U.S. Civil War. Retrieved May 21, 2018, from
wmblogs.wm.edu/cmbail/the-saddest-affair-a-geologic-perspective-on-the-battle-of-the-crater-u-s-civil-war/
2. Berquist, C. R., Jr., Steele, J., Bailey, C. M., Occhi, M. E., Berquist, P. J., & Shockley, D. (2014). Geologic conditions affecting tunnel construction at the 1864 Battle of the Crater, Petersburg, Virginia. Geological Society of America Abstracts with Programs, 46(6), 313.
3. Cross, A., Berquist, C. R., Occhi, M., Strand, J., & Bailey, C. M. (2017). Geology and the Petersburg Campaign in the American Civil War. In C. M. Bailey & S. Jaye (Eds.), From the Blue Ridge to the beach: Geological field excursions across Virginia: Geological Society of America field guide (Vol. 47, pp. 163–174). Boulder, CO: The Geological Society of America.
4. Dischinger, J. B. (1987). Late Mesozoic and Cenozoic stratigraphic and structural framework near Hopewell, Virginia. U.S. Geological Survey Bulletin (Vol. 1567, 56p).
5. Hess, E. J. (2009). In the Trenches at Petersburg: Field Fortifications and Confederate Defeat (403p). The University of North Carolina Press.