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All answers having "U.S. author" as clue:

3 Character Answers:

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DAY

POE



4 Character Answers:

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AGEE

SHAW

URIS



5 Character Answers:

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ODETS

OHARA

VIDAL



6 Character Answers:

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CAPOTE

MAILER

STEELE



9 Character Answers:

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BRETHARTE



10 Character Answers:

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HENRYJAMES