Tidal phenomena of the St. John River at low summer level This book, "Tidal phenomena of the St. John River at low summer level", by A. Wilmer Duff, is a replication of a book originally published before 1897. 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.