Earth Sky + Water, Common Mushrooms of the Northeast, Folding guide. 57 species - both common and rare - found in northeastern North America. Tips for identification. Illustrations and text by Kirsten McKnight Ward, Joseph R. Rohrer, and Karl B. McKnight, co-authors of the Peterson Guide to Mushrooms, Revised Edition. Indestructible lamination makes this guide waterproof. Designed and manufactured in the USA. Instant access to just what you need to know.