Available on line at 2. Natural Law consists of this first judgment and other most general ones that are beyond contest. What were you thinking. There were three principal series - sets of the polonaises, nocturnes, concerti, mazurkas and scherzos for EMI in the 1930s (volumes 4 - 6), mono LPs for RCA of these same pieces plus the preludes and waltzes (volumes 17 and 26 - 29) and final RCA stereo remakes of all but the preludes plus the sonatas and ballades (on volumes 44 - 50).