Books will NOT be accepted with any of the following conditions: workbooks, lab manuals, and study guides with any writing in them; textbooks with practice tests that have been filled out; missing or loose pages; major wear to the binding; tears to the cover or pages; water, moisture damage, mold, or stains; fire or smoke damage; strong odor of any kind (including cigarette odor); exceeds C4B's maximum quantity of each ISBN; highlighting, underlining, or writing that appears on more than 50% of the book or if any of the text is obscured or difficult to read.