The National Union Catalog (NUC), a repository of the cataloged holdings of major research libraries of the United States and Canada, has significance in the area of Hungarian studies despite special problems encountered in the separation of these cards from those in other languages and in editing Hungarian names and the use of accents. The Union Catalog is a valuable reference tool for researchers in Hungarian studies as it provides a bibliography of holdings for major United States and Canadian libraries in easily available book form. It also aids in cataloging, reference, and as a selection tool for library acquisitions. (CWM)