ESTUDIOS SOBRE LA PONZONA DEL ALACRAN I INTRODUCCION DATOS ESTADISTICOS PARA SABER LA MORTALIDAD EN LA REPUBLICA
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Instituto de Salubridad y Enfermedades Tropicales, CD MEXICO, DF, MEX
Abstract
The morph and paleobiology of the Mexican spp of the bivalve genus Ptychomya are discussed 3 forms are recognized P mexicana n sp and P m var tehuacanensis n var, both from the vicinity of Tehuacan, Oaxaca (the former from other localities as