1. An analysis of indoor radon levels and its associated risk for the state of Ohio;Agarwal,1991
2. Radon hazards associated with outcrops of the Devonian Oil Shale;Harrell,1988
3. Multivariate stepwise regression analysis of indoor radon data from Ohio, U.S.A.;Harrell;Journal of Official Statistics,1989
4. Harrell, J.A., Belsito, M.E. and Kumar, A., Radon hazards associated with outcrops of the Ohio shale (Devonian) in Ohio: Environmental Geology and Water Sciences, V. 18, No. 1, in press.
5. Development of an indoor radon information system for Ohio and its application in the study of the geology of radon in Ohio;Kumar,1990