Twelve issues of Library Journal, randomly selected every other year from 1958 to 1980, were analyzed under the headings of general data, articles, text departments, book review sections, and advertisements to determine any changes such as scope, emphasis, and audience. Findings included increases in the number of pages per year during 1958 to 1966, followed by a drop to under 2700 pages after 1976; a substantial increase in subscription costs accompanied by a decrease in the number and relative importance of articles; an increase of six to nine percent in illustrations in the text departments in the latter six years; an increased number of reviews of adult books; increased percentages of advertisement pages; an increase of one-third in the number of display advertisements; and a decrease of more than 50 percent in the number of classified ads. Occurrences which may account for these changes include a change in editor of Library Journal in 1968; an increase in page size in January 1967; the takeover of Bowker Publishing Company by Xerox in February 1968; and the establishment of School Library Journal, a part of Library Journal since 1954, as a separate journal in 1974. Six tables are provided. (RBF)