Here I will go noting some pages that can serve us of aid:
-http://www.didstore.es
-Numismas
-http://www.alava.net/euroaraba/home.htm
-Fuenterrebollo
-http://www.mundimoneda.com
-http://www.mundonumismatico.com
-Papel moneda
-http://www.worldcoingallery.com