Boerboom, T., & Holm, D. (2000). Ri-56 Paleoproterozoic Intrusive Igneous Rocks of Southeastern Stearns County, Central Minnesota. Minnesota Geological Survey. https://oaks.kent.edu/node/1974
Boerboom, Terrence, and Daniel Holm. 2000. “Ri-56 Paleoproterozoic Intrusive Igneous Rocks of Southeastern Stearns County, Central Minnesota”. Minnesota Geological Survey. https://oaks.kent.edu/node/1974.
Boerboom, T., and D. Holm. Ri-56 Paleoproterozoic Intrusive Igneous Rocks of Southeastern Stearns County, Central Minnesota. Minnesota Geological Survey, 1 Jan. 2000, https://oaks.kent.edu/node/1974.