I am in the UK so I understand that I am in the equivalent of zone 8. Having said that some of the plants I grow are plant / replant perennials so the tubers spend the winter tucked up in a box in a cool dry place away from the winter freezes. Also, a good bit of the book is about growing in polycultures and whilst the actual plants might not apply to other areas and zones the theory and general methods should apply anywhere.
Just last night I checked out Eric Toensmeier's Perennial Vegetables from the library. I spent a lot of time, sweat and resources on my garden this year and did not have much to show for it. I am now committing my time to learn more about edible perennials. I am in zone 6b and half about 1/5 acre to work with. Your book looks like a wonderful resource that I need to check out.
I am glad to have found you and your book at this moment in time.