Nat Hart's recipes are comprised of food recipe cards, recipe collections, and recipes clipped from print material collected by Hart from 1970 to 1994.

Nat Hart's professional membership papers and photographs contain correspondence, documents, and photographs from his activity in professional organizations from 1976 to 1993. Hart was a member of the National Restaurant Association, the Food and Beverage Directors Association, and Confrerie de la Chaine des Rotisseurs, Las Vegas Chapter.