Evidence for this paper is based on the application of cross-section wage level and change regressions to national samples of teachers in determining the impact of unionization on teacher salaries. The findings contradict most of the previous empirical research (supporting a weak union paradigm and finding only marginal wage effects for unionization) and demonstrate that in 1977 unionized teachers and related teaching personnel had increased their wages by 12 to 21 percent more than nonunion workers. These findings are consistent with auxiliary evidence presented concerning the impact of unionization on the wages of nonteaching white-collar public employees. (Author/WD)