Based on data compiled from issues of the American Library Association's Newsletter on Intellectual Freedom, this paper analyzes over 500 censorship cases occurring in U.S. educational institutions and public libraries from 1976 through 1980, and makes a comparison with a previous study of U.S. censorship covering 1966 to 1975. Information is presented on censorship attempts by year and level of educational institution affected; number of items censored by year; formats of censored material; sources of censorship attempts; reasons for censorship attempts; and titles of censored books, dictionaries, and films. A censorhip index by state and geographical region is also presented. Eight tables and three references are provided. (Author/ESR)