Regulations.gov document: Szabo, Z., and O.S. Zapecza, 1991, Geologic and geochemical factors controlling uranium, radium-226, and radon-222 in ground water, Newark Basin, New Jersey: Gundersen, L.C.S. and Wanty, R.B., eds., Field studies of radon in rocks, soils, and water, U.S. Geological Survey Bulleting 1971, [W-00-12-I-C-5]
Regulations.gov document: Szabo, Z., and O.S. Zapecza, 1991, Geologic and geochemical factors controlling uranium, radium-226, and radon-222 in ground water, Newark Basin, New Jersey: Gundersen, L.C.S. and Wanty, R.B., eds., Field studies of radon in rocks, soils, and water, U.S. Geological Survey Bulleting 1971, [W-00-12-I-C-5] — retained record — High Signal