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Cohen, B.L., 1991, Variation of radon levels in U.S. homes with various factors: Air Pollution Control Association, Journal, v. 38, no. 2, p. 129-134.

Cohen, B.L., 1991, Variation of radon levels in U.S. homes correlated with house characteristics, location, and socioeconomic factors: Health Physics, v. 60, no. 5, p. 631-642.

Cohen, B.L., 1989, Measured radon levels in U.S. homes, in Harley, N.H., ed., Radon - Proceedings of the twenty-fourth annual meeting, 30-31 March, 1988: Bethesda, Md., National Council on Radiation Protection and Measurements, p. 170-181.

Cohen, B.L., 1986, A national survey of 222Rn in U.S. homes and correlating factors: Health Physics, v. 51, no. 2, p. 175-183.

Brookins, D.G., 1990, The indoor radon problem: New York, Columbia University Press, 229 p.

Barnett, J.M., McKlveen, J.W., and Hood, W.K., III, 1990, Determination of radon-222 in ground water using liquid scintillation counting - Survey of Carefree-Cave Creek water basin in Arizona, in Cross, F.T., ed., Indoor radon and lung cancer: Reality or myth?: Richland, Wash., Battelle Press, p. 449-455.

Barnett, J.M., 1990, Radon-222 in drinking water: Liquid scintillation detection methods and estimated doses to the lungs: Tempe, Arizona State University, M.S. thesis, 94 p.

Alter, H.W., and Oswald, R.A., 1987, Nationwide distribution of indoor radon measurements: A preliminary data base: Air Pollution Control Association, Journal, v. 37, no. 3, p. 227-231.

Alexander, Barbara, Rodman, Nathaniel, White, S.B., and Phillips, Jeffrey, 1994, Areas of the United States with elevated screening levels of 222Rn: Health Physics, v. 66, no. 1, p. 50-.

Euge, K.M., Schell, B.A., and Lam, I.P., 1992, Development of seismic acceleration contour maps for Arizona - Final report: Arizona Department of Transportation Report no. AZ92-344, 328 p., 5 sheets, scale 1:1,000,000 [approx.].