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All answers having "Current best seller." as clue:

5 Character Answers:

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TOPAZ



6 Character Answers:

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ACTONE

HAWAII



7 Character Answers:

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KONTIKI



10 Character Answers:

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CONVENTION

EASTOFEDEN



11 Character Answers:

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SHIPOFFOOLS



12 Character Answers:

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THEEIGHTHDAY



13 Character Answers:

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ANDERSONVILLE



14 Character Answers:

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ISPARISBURNING

SEVENDAYSINMAY



15 Character Answers:

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BYLOVEPOSSESSED

NEWENGLISHBIBLE

THEKENNEDYYEARS

YOUNGBLOODHAWKE



17 Character Answers:

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ELIZABETHAPPLETON



18 Character Answers:

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UPTHEDOWNSTAIRCASE