Chamberlin and Salisbury. Geology, Vol. II, Chaps. I and II. 1909. T. C. Chamberlin and other Writers. The Tidal Problem. Carnegie Inst. of Washington. Pub. No. 107. 1909. Darwin. The Tides. 1911. Poincaré. Hypothèses cosmogoniques. Paris. 1911.
The Age of the Earth · The Wunder Library — complete classics, free to read, with narration.