books.google.com - In 1975, Let it Rot! helped start the composting movement and taught gardeners everywhere how to recycle waste to create soil-nourishing compost. Contains advice for starting and maintaining a composting system, building bins, and using compost. Third Edition. 318,000 copies in print....https://books.google.com/books/about/Let_it_Rot.html?id=56oADno0VSgC&q=nitrogen+materials&utm_source=gb-gplus-shareLet it Rot!