1. LA COMISION REGULADORA DE ENERGIA. 2. LA REGULACION DE GAS NATURAL EN MEXICO. 3. LEY REGLAMENTARIA DEL ARTICULO 27 CONSTITUCIONAL EN EL RAMO DEL PETROLEO Y REGLAMENTO DE GAS NATURAL

4to : Or quarto. A term used generally to describe the approximate size of a book, a book that is about 10" to 12" tall and roughly squarish in shape. The term is based on the size of paper traditionally used by book printers which has been folded and cut into 16 pages.