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All answers having "Type of book" as clue:

4 Character Answers:

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LIFE



5 Character Answers:

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EGRET

EXTRA

NOVEL

POPUP

SCRAP



6 Character Answers:

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LEDGER

PASSON

READER



7 Character Answers:

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SHOCKER



8 Character Answers:

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HARDBACK



9 Character Answers:

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PAPERBACK

POTBOILER



10 Character Answers:

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PAPERCOVER

SPELUNKING



12 Character Answers:

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PRIDEOFPLACE