1. Brookins, D. G., Treves, S. B., and Bolivar, S. L., 1975, Elk Creek, Nebraska Carbonatite: Strontium geochemistry: Earth Planet. Sci. Lett., v. 28, p. 79–82.
2. Burchett, R. R., 1982, Tectonics and seismicity of eastern Nebraska: Nebraska Geol. Survey Rept. Invest., no. 6, p. 1–53.
3. Burfeind, W. J., Carlson, M. P., and Smith, R., 1971, The Elk Creek geophysical anomaly, Johnson and Pawnee Counties, Nebraska (abst.): Geol. Soc. Am. Prog. Abstr., v. 3, no. 4, p. 254.
4. Carlson, M. P., 1972, Summary of the Elk Creek Anomaly: Nebraska Geol. Survey Open File Rept., 3 p.
5. Carlson, M. P., 2001, Accretionary basement control on structure of central (abst.) USA: Geol. Soc. Am. Abstr. Prog., v. 33, no. 6, p. 434.