only 1 use
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- I remember the portrait of him up in Gatsby's bedroom, a gray, florid man with a hard, empty face — the pioneer debauchee, who during one phase of American life brought back to the Eastern seaboard the savage violence of the frontier brothel and saloon.p. 100.7
frontier = a wilderness area starting to be settled
There are no more uses of "frontier" in The Great Gatsby.
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