cdigital.dgb.uanl.mxcdigital.dgb.uanl.mx/la/1080020695/1080020695_36.pdfcipiendum ut primum fenomena...
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cdigital.dgb.uanl.mxcdigital.dgb.uanl.mx/la/1080020695/1080020695_36.pdfcipiendum ut primum fenomena summantur circa unum— quodque genus et deinde eorum. causæ dicantur. El principio,