Looks like he has published several books.
Is it this one?
For a book with more personal experience collecting and cooking wild edibles I always suggest [Foragers Harvest](//www.amazon.com/Foragers-Harvest-Identifying-Harvesting-Preparing/dp/0976626608/ref=sr_1_1?ie=UTF8&qid=1464649877&sr=8-1&keywords=Foragers+harvest). It's all first hand experience. *edit because mobile
https://www.amazon.com/gp/product/0976626608/ref=ox_sc_act_image_12?smid=ATVPDKIKX0DER&psc=1
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this book is decent from what i can tell.
https://www.amazon.com/Foragers-Harvest-Identifying-Harvesting-Preparing/dp/0976626608/
Dandelion greens and nettles.
try these two:
http://www.amazon.com/The-Foragers-Harvest-Identifying-Harvesting/dp/0976626608
and
I have the second one and it is great. I have been meaning to get the first one too. These two books offer in depth descriptions and color photographs of the plants so that you can have a much better chance of accurately identifying them (much better than a black and white sketch of the plant, like in other books).
hth