The Oil-Shales of the Lothians. Pt. I. the Geology of the Oil-Shale Fields, By R. G. Carruthers, Based On the Work of H. M. Cadell And J. S. Grant Wilson. Pt. Ii. Methods of Working the Oil-Shales, By W. Caldwell. Pt. Iii. the Chemistry of the Oil-Shales, Read Online