McKeldin, with the largest collection of books and journals on campus, is the primary library for graduate research. The National Trust for Historic Preservation (NTL) non-circulating collection is housed in the Maryland Room of McKeldin. To access this collection, bring the look-up information for the materials you need. You will be asked to put your bag in the locker provided before entering the security gate. Give the look-up information to the librarian, who will retrieve the materials for you. Copy machines are there for your use.