This publication is Part 3 of a three-part report on a national survey of salaries and wages in the public schools. The survey, conducted in fall 1974, collected data on salaries or annual earnings of five selected clerical positions and on hourly wage rates of five selected nonclerical support positions. The clerical category includes secretaries/stenographers, accounting or payroll clerks, and clerk-typists employed in central-office positions as well as school secretaries/stenographers and library clerks employed in individual school buildings. The nonclerical support category includes instructional and noninstructional teacher aides, building custodians, cafeteria workers, and bus drivers. The purpose of the survey is to provide school administrators with accurate, timely, and reliable data for comparative purposes. Wage and salary data are analyzed according to four enrollment groupings, four per pupil expenditure levels, eight geographic regions, and by tabular listings of individual districts. The first volume (Part 1) reports salaries scheduled for professional personnel. The second volume (Part 2) reports salaries actually paid professional personnel. (Author/DN)