I found a book in the catalog, but I can't find it on the shelves.
Answer
Check to make sure the item is marked "Available" in the catalog and is not a reference or reserve item.
Check if the item is located in the main collection, or is in a separate section, like dissertations.
Check to make sure it is in your local library. The location of the item is identified on the left side of the screen. If you are looking at the brief display record it might say “There are additional copies/volumes of this item.” Click on the title to show additional copies.