CATNYP, the catalog of the research libraries, and LEO, the catalog of the
NPL patrons who wish to borrow items from the New York Public
Library must place their requests through
Library of Congress
The Library of Congress is the largest research library in the world. It
generally fills interlibrary loan requests only when they cannot be filled by
other institutions. Nevertheless, the Library of Congress catalog is an
invaluable aid to verification of bibliographic citations.