1. Barnes PW, Harrison AT (1982) Species distribution and community organization in a Nebraska Sandhills mixed prairie as influenced by plant/soil–water relationships. Oecologia 52:192–201
2. Belmecheri S, Namiotko T, Robert C, von Grafenstein U, Danielopol DL (2009) Climate controlled ostracod preservation in Lake Ohid (Albania, Macedonia). Palaeogeogr Palaeoclimatol Palaeoecol 277:236–245
3. Bleed A (1990) Groundwater. In: Bleed A, Flowerday C (eds) An Atlas of Sand Hills. University of Nebraska-Lincoln, Conservation and Survey Division, Resource Atlas No. 5A, pp 67–92
4. Bradley E, Rainwater F (1959) Geology and groundwater of the upper Niobrara River Basin, Nebraska and Wyoming. US Geol Surv Water Supply Paper 1368:44–49
5. Correns CW (1972) Behavior during weathering and rock alteration. In: Wedepohl KH, Correns CW, Shaw DM, Turekian KK, Zeman J (eds) Handbook of Geochemistry. Spring, New York, pp 33-G1