Charlie ...I hope that this is a good tip for you. "Rosario" is also the name of a very famous early developement (now a fancy resort), in the American San Juans, just south of Vancouver. If you google "Rosario" and search for the development of the limestone kilns, I'm sure you'll pick up the track. Again, I hope this clue helps. CHEERS to you and Judy! Bob(deckman)Nelson