Hard section of a textbook, perhaps

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This crossword clue is for the definition: Hard section of a textbook, perhaps.
it’s A 35 letters crossword puzzle definition.
Next time, when searching for online help with your puzzle, try using the search term “Hard section of a textbook, perhaps crossword” or “Hard section of a textbook, perhaps crossword clue”. The possible answerss for Hard section of a textbook, perhaps are listed below.

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Possible Answers: SPINE.

Last seen on: Washington Post Crossword Friday, January 27, 2023