Sun R.J. Regional aquifer-system analysis program of the U.S.geological survey,1978-1992 / R.J.Sun,R.H.Johnston, 1994. - VII,126 p. p. - Текст : непосредственный.
Bertoldi G.L. Ground water in the Central Valley,California : a summ. rep. / G.L.Bertoldi,R.H.Johnston,K.D.Evenson, 1991. - V,A44 p. p. - Текст : непосредственный.
Johnston R.H. Hydrologic budgets of regional aquifer systems of the United States for predevelopment and development conditions : Regional aquifer-system analysis / R.H.Johnston. - v,34 p. p. - Текст : непосредственный.