The supplemental .zip archive for this publication contains the following files. ? GwembeTongaData.dta: Stata data file for the Gwembe Tonga data. This file includes individuals age 20 years or over, union and fertility indicators, from 1950 through 1995. File includes indicators necessary to run the subsequent infertility analysis. Data has been de-identified and contains only numeric ids. ? SubsequentlyInfertileAnalysis_GT.ado: Stata do file that executes the analysis required to obtain tables 2 and 3 in the text, and for producing the data necessary to make the curves for the Gwembe Tonga men and women included in Figure 1. Zambia Demographic and Health Survey data can be obtained from Measure DHS and similar analyses can be conducted to obtain the results in Table 4 and the data necessary to graph the curves for ZDHS in Figure 1.