Anaerobic digestion of organic solid waste for energy production

Very Good

This is a preloved book, but it is in pristine condition. There should be no yellowing, no foxing, and no writings of any kind on the pages. This book is good as new — lucky you!

Good

This book has been used, but it is still in a clean condition. There should be no brown spots, but do expect slight yellowing or some writings on the pages.

Well-Read

We do our best to ensure the quality of our books, but there is no escaping the wear and tear that comes with time. Pages might be yellowing or largely annotated, with some foxing on the exterior of the book. This is a well-read book, but this also means that the previous owner probably really enjoyed it! This category also includes books that are heavily annotated but are otherwise in a clean condition without brown spots.