CFR > Title 50 - Wildlife and Fisheries > CHAPTER II—NATIONAL MARINE FISHERIES SERVICE, NATIONAL OCEANIC AND ATMOSPHERIC ADMINISTRATION, DEPARTMENT OF COMMERCE > SUBCHAPTER C—MARINE MAMMALS (Parts 216–229) > PART 221—PRESCRIPTIONS IN FERC HYDROPOWER LICENSES > SUBPART A—General Provisions (§221.1 to §221.4)