Peter Gerhard: The North Frontier of New Spain (Princeton, New Jersey: Princeton University Press, 1982, £42.30). Pp. 454.Marvyn Helen Bacigalupo: A Changing Perspective: Attitudes toward Creole Society in New Spain (1521-1610) (London: Tamesis Books, 1981, £16). Pp. 159.Evelyn Hu-DeHart: Missionaries, Miners and Indians. Spanish Contact with the Yaqui Nation of Northwestern New Spain 1533-1820 (Tucson: The University of Arizona Press, 1981, paper $9.95). Pp. 152.David G. Sweet and Gary B. Nash (eds.): Struggle and Survival in Colonial America (Berkeley, Los Angeles and London: University of California Press, 1981, £17). Pp. 398.