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6th Brazilian Mathematical Congress issue of Brazil
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Short desc: 6th Brazilian Mathematical Congress
Issuer: Brazil Date: 7/21/1967 Occasion: 6th Brazilian Mathematical Congress Consists of 1 stamp: (See stamps as list) 5c bl&blk d=Moebius strip All are wmk=CORREIO*BRASIL*(5mm) perf=11.5x11 |
