A special stamp designed to generate funds for cancer research has raised $21.5 million since it was released in 1998, and will remain on sale for another year, the Associated Press reported July 26.
The stamp, known as a semipostal, sells for 40 cents, with the amount in excess of the 34-cent postage rate donated to breast cancer research.
So far, 312.7 million of the stamps have been sold.
The U.S. Postal Service is seeking proposals for its next semipostal, which will replace the breast cancer stamp and be sold through 2004.
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