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- I was to go down the sandy spit that divides the anchorage on the east from the open sea, find the white rock I had observed last evening, and ascertain whether it was there or not that Ben Gunn had hidden his boat, a thing quite worth doing, as I still believe.Chapter 22 — How My Sea Adventure Began (38% in)
There are no more uses of "ascertain" in Treasure Island.
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