The Tlaxcaltecans : prehistory, demography, morphology and genetics / ed. by M. H. Crawford. - Lawrence, KS : Univ., Dep. of Anthropology. - 208 S. : 40 Ill. ; 85 Tab. ... symposium entitled "Population studies in Tlaxcala, Mexico", held ... in Mexico City on Nov. 20, 1974. - Crawford, Michael H. (1976)