Check out these 2 books!!
..incredible thesis and practical manual, groundbreaking. Get this from the library.
Perennial Vegetables: From Artichokes to Zuiki Taro, A Gardener's Guide to Over 100 Delicious and Easy to Grow Edibles by Eric Toensmeier. Easier than the previous volume - start with this book. Describes the 'sheet mulching' techinque very very well, and in a perennial vegetable/plants context. Read this and you'll want to enact this in any private or community garden.