Indiana Nut Growers Association  
   Non profit organization growing hardy nut and fruit trees, as well as advancing their cultivation and propagation.
   http://www.nutgrowers.org/

Northern Nut Growers Association  
   American-based group provides information on cultivation of almond, chestnut, hazelnut (filbert), pecan, pistachio, and Persian (English, Carpathian) walnut trees as well as of American native fruits the persimmonn and pawpaw.
   http://www.icserv.com/nnga/

Nutgrowers Ring  
   Webring featuring amateur grower organizations and specialist nut nurseries.
   http://s.webring.com/hub?ring=thenutgrowersrin