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science letter old university europe anniversary envelope culture branch mathematics mail formula correspondence macro ensign hobby ancient medicines antique academy curve math function aged expression delta integral collection physicians historic 1966 bracket canceled centenary commemorative denoting emblem european issue laconic message romaniaCancelled Postage Stamp Printed By Romania, That Shows Mathematics, Romanian Academy Centenary Editorial Photo
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Cancelled postage stamp printed by Romania, that shows Mathematics, Romanian Academy Centenary #298661565
Description
Cancelled postage stamp printed by Romania, that shows Mathematics, Romanian Academy Centenary, circa 1966.
This image is editorial
