February issue includes Appendix entitled Directory of United States Government periodicals and subscription publications; September issue includes List of depository libraries; June and December issues include semiannual index.

This comprehensive yet concise annual annotated reference source catalogs the important series, periodicals and reference tools published by U.S. government agencies. Over the years, the index section of the Guide to U.S. Government Publications has expanded to more than 40,000 entries. Agencies and titles are indexed, followed by a keyword title index for quick and easy referencing. No other single resource provides historical and current information on U.S. government publications in one place.