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copied!<ol> <li>Ask the interviewer for more information about the librarian and go from there. In particular, find out if he's susceptible to bribery (I mean the librarian, but come to think of it this might go for the interviewer as well). <li>Double-check for dumb mistakes (wrong card, wrong shelf, "661-88" is reall "88-199" and so on). <li>Search the drawer of borrowed-book cards. If it's been borrowed, note the due date and come back later, or note the borrower's home address and go to plan B. <li>Look in the vicinity, a few books in either direction and the shelves above and below, in case it was incorrectly reshelved. <li>Check the tables, floors, photocopiers and return carts. <li>Look for a gap on the shelf. If there is a gap in the right spot then at least you know you're looking in the right place. If there's no gap then look for a book on that shelf that doesn't belong-- somebody may have swapped them by mistake. If there's no such misplaced book then maybe the book was never on this shelf, see below. <li>Look for dust on the shelf. It might indicate whether a book has been removed within the past month. Likewise check the index card for signs of age. The flowchart gets a little complicated, but the book may have been lost years ago. <li>Check the index system: if the book doesn't have the right number for its subject/title/author/whatever, then there is a typo on the index card and you must calculate the correct number yourself to find out where the book really is. <li>Just go out and buy the damned book, your time is more valuable than this. </ol>

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