IMPORTANT PAPERS
1913, Knopf
1918, Knopf
1936, Hewett and others
1938, Kelley
1958, Hall
1958, Hall and MacKevette
1962, Hall and MacKevette
1975, Czamanske and Hall
1991, Newberry and others
1913, Knopf
1918, Knopf
1936, Hewett and others
1938, Kelley
1958, Hall
1958, Hall and MacKevette
1962, Hall and MacKevette
1975, Czamanske and Hall
1991, Newberry and others