1. BHE (2002) A summary of the on-going climate monitoring study in the Lewisburg Limestone Mine, Preble County, Ohio, May 2001–July 2002. Report to U.S. Fish and Wildlife Service, Reynoldsburg, Ohio
2. Brack V Jr, Dunlap RK, Johnson SA (2003) Advantages of infrared thermometers for recording temperatures in caves. Bat Res News 44:62–63
3. Brack V Jr, Twente JW (1985) The duration of the period of hibernation in three species of vespertilionid bats I: Field studies. Can J Zool 63:2952–2954
4. Clawson RL, LaVal RK, LaVal ML, Caire W (1980) Clustering behavior of hibernating Myotis sodalis in Missouri. J Mammalogy 61:245–253
5. Cropley JB (1965) Influence of surface conditions on temperatures in large cave systems. National Speleological Soc Bull 27:1–10