Favorite books on permaculture?

I recently moved and had to leave all of my gardening books behind. I had a collection of 20+ different books on everything from specifics like soil health to broader topics like general gardening. I read all of them regularly.

Now I don’t have as much space for books but have a huge space to garden. I’d like to have a permaculture book I can throw into my backpack for reference when I go out to the new garden to plan.