Sort ascending by Teitl | Blynyddoedd a Rhifau | Sort ascending by Math o ddeddfwriaeth |
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The Clean Air (Emission of Grit and Dust from Furnaces) Regulations 1971 | 1971 No. 162 | Offerynnau Statudol y Deyrnas Unedig |
The Clean Air (Measurement of Grit and Dust from Furnaces) Regulations 1971 | 1971 No. 161 | Offerynnau Statudol y Deyrnas Unedig |