@Denim Deb
Dave Jacke is owrking on a book about these practices in this part of the world. It is not easy! But I know he is working on it. There is an FB group for this, also.
I will see if I can poke around and find more official information.
Meantime, I can tell you that I have pollarded sugar maple, white ash, red oak, black cherry, bitternut hickory and tulip tree/whitewood/Liriodendron tulipifera (there are just so many names for this one I did not want to confuse you, it is not a magnolia).