WASHINGTON - The Treasury sold $11 billion of 30-year bonds yesterday at an average yield of 6.33%, down from the 6.97% yield incurred in the previous sale on May 13, and the lowest since the Treasury began regular 30-year bond auctions in 1978.

The average coupon was 6 1/4%, down from 7 1/8%. The average price was 98.931.

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