Exemption from National Calamity Contingent Duty for crude oil produced under PSCs and NELP blocks preserves tax relief. Notification exempts crude petroleum oils produced in specified Production Sharing Contract fields and in exploration blocks awarded under the New Exploration Licensing Policy from the National Calamity Contingent Duty. The exemption is granted under section 5A of the Central Excise Act in conjunction with the Finance Act provision and applies to petroleum oils and oils obtained from bituminous minerals, crude, originating in the listed PSC fields or NELP-awarded blocks.