JERROLD ZWIRN is a reference librarian in a branch of the District of Columbia Public Library. He is the author of Congressional Publications, (1983), Congressional Publications and Proceedings (1988), and the earlier edition of this guide published by Greenwood Press in 1989. He has contributed several articles to Government Publications Review. An abiding interest in government decisionmaking and library service has led him to study the relationship between federal business and information output.