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Mr. Pardoe
asked the Minister of Aviation Supply what investigations he has made of the long-term effect of supersonic aircraft on the upper atmosphere.
Mr. David Price
I would refer the hon. Member to my right hon. Friend's reply to the Question on this subject from the hon. Member for Fife, West (Mr. William Hamilton) on 18th November, 1970.—[Vol. 806, c. 400.]