CFR

Title 1 - General Provisions
Title 2 - Grants and Agreements
Title 3 - The President
Title 4 - Accounts
Title 5 - Administrative Personnel
Title 6 - Domestic Security
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Title 8 - Aliens and Nationality
Title 9 - Animals and Animal Products
Title 10 - Energy
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Title 13 - Business Credit and Assistance
Title 14 - Aeronautics and Space
Title 15 - Commerce and Foreign Trade
Title 16 - Commercial Practices
Title 17 - Commodity and Securities Exchanges
Title 18 - Conservation of Power and Water Resources
Title 19 - Customs Duties
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Title 23 - Highways
Title 24 - Housing and Urban Development
Title 25 - Indians
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Title 35 - Panama Canal
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Title 38 - Pensions, Bonuses, and Veterans' Relief
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Title 43 - Public Lands: Interior
Title 44 - Emergency Management and Assistance
Title 45 - Public Welfare
Title 46 - Shipping
Title 47 - Telecommunication
Title 48 - Federal Acquisition Regulations System
Title 49 - Transportation
Title 50 - Wildlife and Fisheries

131.965—Sounding of whistle.

No vessel may sound its whistle within any harbor limits of the United States unless it needs to.

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