You searched for: Institution University of Michigan. Libraries Remove constraint Institution: University of Michigan. Libraries Place At and near the summit of El Cerro de Ejecatepetl; vicinity of El Ejido de Tepetlampa, 14-16 km northwest of Campo Experimental de Hule, El Palmar, Zongolica Remove constraint Place: At and near the summit of El Cerro de Ejecatepetl; vicinity of El Ejido de Tepetlampa, 14-16 km northwest of Campo Experimental de Hule, El Palmar, Zongolica