Do you know of a book for . . . .

I am looking at helping a friend do something permaculture like with some very steeply sloped land with trees, hills and valleys - not smooth, think lumpy.  There is lots of trees so I don't know how much can be done with big machinery either, unless trees were removed.

Does anyone have books, links or videos to recommend that might fit this situation? 

Thanx

J. Russel Smith's Tree Crops: A Permanent Agriculture would probably be worth a read.  maybe not exactly what you're looking for, though.

Isn't that the kind of terrain that Sepp Holzer has?  In which case "Sepp Holzer, Rebel Farmer"

one of Bill Mollison's phamplets (free online at scribs) that talks about islands and mountains has some good info for steep slopes..

As a general reference for gardening in temperate forests: Edible Forest Gardens (in two volumes) by Dave Jacke with Eric Toensmeier is a great book. It applies best to zone 6 but is valid from around 4-8 in all forested areas. It concentrates mainly on the plant side of things, giving only a few indications on water flow control and saying almost nothing about animal husbandry. I think this is simply because the books were long enough already.

Thanks everyone    I'm looking deeper into these resources to find specific ideas now.

The natural way of farming by masanobu fukuoka explains a lot of the big picture of farming.