J. Thomson The Origin of the Permian Basin of Thornhill Geology, Structural geology, Quaternary geology TDGNHAS Series II, 1 (1876-78), 43(3.72 MB)
J. Thomson Notes on a Glacial Deposit near Thornhill Geology, Quaternary geology TDGNHAS Series II, 1 (1876-78), 70(3.72 MB)
