Fruition’s Apple Tree Growing Guide
Fruition’s Free Organic Orcharding Course
Fruition’s pre-recorded Fruit Q & Qs Webinar Library
New England Tree Fruit Management Guide
Cornell’s Guide to Growing Fruit at Home
Cornell’s Tree Fruit Resources 

Apples:
All resources above and…
The Holistic Orchard and The Apple Grower books by the late Michael Phillips.
A Grower’s Guide to Organic Apples from Cornell

Elderberry: University of Vermont
Figs: Penn State Extension
Grapes: Cornell Cooperative Extension
Mulberry: Maine Organic Farmers & Gardeners Association
Pawpaws: Cornell Cooperative Extension
Chinese Chestnut: Arnold Arboretum
Hazelnut: Cornell Forest Connect
Northern Hardy Pecan: Society of Ontario Nut Growers