"This article presents estimates of the number of undocumented aliens included in the April 1983 Current Population Survey (CPS) derived by subtracting an estimate of the legally resident foreign born population from the survey estimate of all foreign born residents.... Also presented are similar estimates for the November 1979 CPS.... Estimates are presented by period of entry for Mexico and other groups of countries. Comparison of the April 1983 estimate with the census-based estimate and the November 1979 survey-based estimate provide an indication of growth in the undocumented alien population for 1980-83."