This publication summarizes results of the Bureau of Labor Statistics' 18th annual salary survey of selected professional, administrative, technical, and clerical occupations in private industry as of March 1977. The survey provides nationwide salary averages (not including Alaska and Hawaii) and distributions for 78 work-level categories covering 19 occupations in the following industries: mining; construction; manufacturing; transportation, communications, electric, gas, and sanitary services; wholesale trade; retail trade; finance, insurance, and real estate; and selected services. Minimum size of the establishments surveyed was either 100 or 250 employees, depending on the industry. In addition to nationwide statistics, average salary data are also presented separately for metropolitan areas. The appendix contains a discussion of the survey's methodology, occupational definitions for each of the survey categories, and tables that compare average salaries in private industry with corresponding salary rates for federal employees. (Author/JG)