19th Century Biochar Books Public PrivateKelpie Wilson's 19th Century Biochar Books shelfbooks.google.com - This is a collection of books and journal articles from the 19th Century in Europe and North America that address different aspects of using charcoal in agriculture and sanitation.https://books.google.com/books?uid=103761009308336383631&as_coll=1001&utm_source=gb-share |