science · 20 January 1974 · 50 years ago
In 1974, Elizabeth Blackwell, America's first female M.D., was featured on a U.S. postage stamp. An engraved image was printed in violet. It was issued in an 18 cent denomination. The postage rate for a first class surface letter at the time was 8 cents per ounce (airmail 11 cents per ounce).
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