The book "Keys to Fertilizer Fungi" is written by the famous authors Richardson, M. J. (Michael J. Richardson) and Watling, Roy (Roy Watling). This book contains keys to identify mushrooms that grow on animal manure. The authors describe in detail the morphological features of these mushrooms, provide illustrations and instructions for their classification. The book will be a useful reference for mycologists, biologists and all those interested in the study of mushrooms and their ecology.