Bibliographic index of American Ordovician and Silurian fossils This book, "Bibliographic index of American Ordovician and Silurian fossils", by Ray S. Bassler, is a replication of a book originally published before 1915. It has been restored by human beings, page by page, so that you may enjoy it in a form as close to the original as possible. This book was created using print-on-demand technology. Thank you for supporting classic literature.