The Los Angeles Comprehensive Bibliographic Database (LACBD) publishes in one comprehensive electronic edition two bibliographies: Los Angeles and its Environs in the Twentieth Century: A Bibliography of a Metropolis, compiled under the auspices of the Los Angeles Metropolitan History Project; foreword by Mrs. Fletcher Bowron; edited with an introduction by Doyce B. Nunis, Jr. Los Angeles: Ward Ritchie Press, 1973.  Los Angeles and its Environs in the Twentieth Century: A Bibliography of a Metropolis: 1970-1990, with a directory of resources in Los Angeles County, compiled and edited by Hynda L. Rudd; foreword by Doyce B. Nunis, Jr. Los Angeles : Los Angeles City Historical Society, 1996.  This project is a collaborative interdisciplinary effort between USC departments and programs and the Los Angeles City Historical Society. General Editors are Philip J. Ethington, Associate Professor, USC Department of History, Hynda L. Rudd, Division Chief, Los Angeles City Clerk Records Management Division, and Lynn Sipe, Director of Collection Resources, USC Information Services Division. Linda McCann, Information Services Division Collection Resources, is Project Editorial Director.  The first phase of the project is supported by a grant from the Southern California Studies Center (SC2) http://www.usc.edu/dept/LAS/SC2/. The project receives support from USC Information Services Division and the Los Angeles City Historical Society. Coverage of the print bibliographies is from 1900 to 1990. Citations primarily are to books, academic theses, and journal articles, excluding newspaper reports. The Los Angeles Comprehensive Bibliographic Database will be maintained and updated to incorporate recent materials on Los Angeles and its environs and extend coverage to 2000. The database is searchable by author, title, format, subject and keyword. Developed by Linda Rudell-Betts, Lexicographer.  The thesaurus for the first phase of the LACBD is a synthesis of two subject indexes from the print bibliographies. It compiles the subject terms into a new subject vocabulary display design. Some terms are created or added from other vocabularies (LCSH, ERIC, UNESCO) to collocate legacy index terms.  The thesaurus provides an overview of the subject coverage of the database and can be used to search the database through the "Search LACBD" menu option. It is constructed according to NISO Guidelines and based on the following definition:  A thesaurus is a controlled vocabulary arranged in a known order in which equivalence, homographic, hierarchical, and associative relationships among terms are clearly displayed and identified by standardized relationship indicators, which must be employed reciprocally.  (ANSI/NISO Z39.19-1993. Guidelines for the Construction, Format, and Management of Monolingual Thesauri Developing Organization: National Information Standards Organization Publication Date: 30-AUG-1993. p 38.)  Linda McCann Los Angeles Comprehensive Bibliographic Database