Method for differentiating and estimating unbleached sulphite and sulphate pulps in paper This book, "Method for differentiating and estimating unbleached sulphite and sulphate pulps in paper", by Roscoe Elwood Lofton, is a replication of a book originally published before 1921. 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.