This book introduces MARC21, an integrated record format used in libraries. Early chapters introduce the needs of library patrons and show how bibliographic information in library catalogs helps patrons and how MARC fits into the picture. Later chapters introduce actual coding in specific fields commonly encountered in MARC records. The book contains many self-assessment tools and examples. The authors own a company that provides training and software services for librarians. Annotation (c) Book News, Inc., Portland, OR (booknews.com)