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All answers having "American novelist" as clue:

4 Character Answers:

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AGEE

CAIN

GREY

URIS



5 Character Answers:

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ALLEN

BASSO

HURST

LEWIS

OHARA

STOWE

WELTY

WOLFE



6 Character Answers:

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CAPOTE

CATHER

FERBER

UPDIKE



7 Character Answers:

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DREISER

FARRELL

WHARTON



8 Character Answers:

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STAFFORD

THORNTON



9 Character Answers:

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LNGLASGOW



10 Character Answers:

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EDNAFERBER

HERMANWOUK