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At the top of the page, click on Help and Advice. A block of 4 choices will come up under a heading of Articles. Click on Fruit Tree Advice. A long list will appear and then scroll down to I think #21 - it says Apple Tree Rootstocks. Click that and a batch of rootstock choices will come up & you can read away on those.
Good reading aimed at habitat work probably doesn't exist too much. Be sure to go through the sticky in the fruit section. Most recent rootstock breeding and ag extension work is aimed at orchard production on more dwarfing rootstocks while we want larger trees for habitat and wildlife.
Pears: seedling, OHxF97, or OHxF87. x87 gives a slightly smaller tree and faster production. If you are going to plant Asian pears, you want those on P. Betulifolia seedlings. Not much more to say about pears.
Apples: For apple, you probably want the larger rootstocks like Bud 118, Polish 18, MM 111, MM106, or seedling rootstocks which are not popular for commercial orchards Extension.org is a good source of information on rootstocks and trials like the NC140 project. Google search for Fazio and Geneva will get you many good files about their breeding research. Genarro Fazio is the head breeder at the USDA Geneva site. You might look up some videos of him on Youtube to get a feel for what a rootstock does and the issues they are trying to solve. Many of the mid-size rootstocks could work while the really dwarfing ones are not ones you'll want. A key is whether your soils, site, climate, disease and pest issue mean you should choose some and avoid others.