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I am trying to figure out what "GSM" means in the reference below; it is from a book on place names in Michigan, and "GSM" plus a year appears in several places.  In particular, I'm trying to find more specifics on what it was that Vine Harding did to "develop" his resort officially in 1906.   WAWATAM BEACH , Cheboygan County : it was the site of… (Show more)