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All answers having "American author" as clue:

4 Character Answers:

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AGEE

DANA

HOWE

URIS



5 Character Answers:

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ALLEN

DRURY

HARTE

OHARA

STOWE



6 Character Answers:

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ALCOTT

CAPOTE

COOPER

IRVING

MAILER

NORRIS

WISTER



7 Character Answers:

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DREISER



8 Character Answers:

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MELVILLE

ZANEGREY



9 Character Answers:

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DOSPASSOS

STEINBECK



10 Character Answers:

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FITZGERALD