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Five years later , Mexico agreed to sell the United States an additional strip of land along the Gila River for $ 10 million . Four years later , Locke was finishing a major in biology and editing a research journal . Thirty years later , Mexico is once again being convulsed by an upsurge of mass struggle , this time centered in the countryside . Several years later , Massie was able to have the American Chemical Society 's national meeting at Fisk . Two years later , Pryor took a break from his bandmates to record a follow-up completed entirely by him .