http://en.wikipedia.org/wiki/Protected_designation_of_origin
Definition of Protected Designation of Origin (PDO)

http://www.cookitsimply.com/category-0020-01g6.html
Cheese Recipes

http://www.granapadano.com/
Consortium for Grana Padano

http://www.parmigiano-reggiano.it
Consortium for Parmigiano Reggiano cheese