Sarah JonesCarlsbad Public Library One of the best-kept secrets in the library world isn’t a hidden room or a rare book—it’s a service that opens the door to materials far beyond our own shelves. Interlibrary Loan, often called ILL, is a powerful way for patrons to access books, articles, and other resources from libraries across the region and even the country. If you’ve ever wished we had a title that wasn’t in our catalog, Interlibrary Loan i…