The weapons section is arranged slightly different from the jutsu sections. The room is set up for those who havent decided on a weapon of choice yet or want to find a second weapon to cover the range that theis current weapon doesn't and are trying to find what suits them best. The books are split into close or far range first on opposite sides of the room with the greatest and least range as the futhest outward and all others in between. From top to bottom it is arranged by difficulty in handeling and on each shelf the books are arranged by the weapons size.
For those who already know exactly what weapon they're looking for a list is posted with the locations of certain weapons. Or they could ask the librarian to get it for them.