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postage

1991, May 24 Costa Rica-Panama Border Treaty 50th issue p. 10.5

-	10col	multi	w. unwmk
-	10col	multi		—	—
-	10col	multi		—	—

1991, Oct 11 Discovery of America 500th in 1991 issue unwmk p. 13

-

4col

multi

1991, Oct 21 1991 provisional issue

-	1col		w. unwmk, p. 10.5
-	3col		p. 10.75	—	—

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