Reddit mentions of Subsistence: A Guide For The Modern Hunter Gatherer: Hunting, Trapping, Fishing & Foraging for a Living In Central Texas (BLACK & WHITE EDITION)

Will you send me a copy?

Here are some more resources. Good luck finding info on cambium layers, but If you do find any, please message me! I'm highly interested to know what their value is, HIGHLY. You can PM me through my YT if you figure it out later on.

Might be limited for wild foods: https://nutritiondata.self.com/

Talks about eadibility, with ACTUAL experiments but doesn't discuss the amount of calories, and nutrition very much: http://www.eattheweeds.com/

Green Deen YT: https://www.youtube.com/user/EatTheWeeds/videos

A couple things here (the book is supposed to be good): http://www.foragingtexas.com/2007/06/foraging-for-calories.html

https://www.amazon.com/Subsistence-Gatherer-Hunting-Trapping-Foraging/dp/1479259667/ref=sr_1_3?ie=UTF8&qid=1479222444&sr=8-3&keywords=texas+foraging

All about the guts and grease (READ THIS!!!): http://www.westonaprice.org/health-topics/guts-and-grease-the-diet-of-native-americans/

Another good essay with a few calorie facts: https://woodtrekker.blogspot.ca/2013/09/living-off-land-delusions-and.html

List of edibles: http://northernbushcraft.com/guide.php?ctgy=edible_plants&region=on

I have another source on wild berries, but I can't find it right now, let me know if you want me to dig deeper and find it.

I would also recommend Samuel Thayer author of Forager's Harvest and Nature's Garden...but he does NOT talk about the nutritional contents of foods.

You should be able to make broad assumptions. If you can't find something on wapato for example, which is a tuber, you could compare it to a potato. Plantain, compare to other leafy greens like spinach, etc. Berries are fairly well known. They won't be exact, but neither are the store bought foods, they are rough estimates. So they should be sufficient.

If you live in Texas this book was pretty interesting.

It did a good job of showing you which plants and animals give you the most bang for your buck in terms of energy.

It really depends on where you will be living though.