Foro Posovatero: Only in spanish.
      Beer-Pedia: Greek site about beer.
      Ronni Arfini: Italian collector of exotic sottobicchieri.
      Bettina & Toni: Swiss collectors of exotic coasters.
      Mircea Gorea: Collector of exotic beer mats.
      Beercoast: US Beer coasters collection.
      Vladimir Gerlich: Czech collector
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