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A method of estimating the parameters of population growth, based upon non­stable population theory, is presented. Data required for this method consist of age structures taken from two censuses, and the distribution of parental ages at birth. These data are typically more reliable and easier to collect than those required for traditional methods relying upon stable population theory. The net maternity function, intrinsic rate of increase, and other stability properties are examined for the Trio of Surinam. Fertility characteristics also are obtained using a life table derived from the same data. In general the results suggest that the Trio maintain a moderate rate of increase, short generation times, moderately low fertility and relatively long birth intervals.