Epstein J.B. Stratigraphy of Silurian rocks in Shawangunk Mountain,southeastern New York:including a historical review of nomenclature / J.B.Epstein, 1993. - IV,L 40 p. 40 p. - Текст : непосредственный.
Epstein J.B. Geology of the New Tripoli quadrangle,Lehigh,Berks,Schuylkill,and Carbon counties,Pennsylvania / J.B.Epstein,P.T.Lyttle, 1993. - IV,17 p. p. - Текст : непосредственный.