by University of Glasgow. Geological Department

1916

by University of Glasgow

1915

by University of Oxford

1908

by University of British Columbia

1929

by University of Toronto

1914

by University of Glasgow. Geological Dept

1927

by McGill University

1921

by Columbia University

1906

by University of St. Andrews

1915

by University of St. Andrews

1912

by Cambridge University Library

1905

by University of Chicago

1899