A Giant Stack of Free Books
Needing to do exercises looking up words in the dictionary based on the guide words at the tops of pages, but you can’t round up enough dictionaries? Every year when the new phone directories come out, round up enough of the old ones for each student to have one. You might try asking your neighbors, or checking with businesses that might have dozens lying around. Not only are you guaranteed that every book is the same, thus making the page numbers consistent for checking answers, they also provide a real world information retrieval exercise.