This article examines the imputation of data in a one percent sample of the nation's ever-married women aged 18–25 from the 1970 Public Use Samples of the Census of Population. Nonwhites are more likely to be imputed data than are whites. Rates of imputation of data are found to be extremely high for some categories of women, and white-nonwhite fertility differentials are affected by imputation. Consequences for study of fertility differentials are noted. It is recommended that researchers routinely use information on imputation of data in any analysis of 1970 Census data.