#MCV061 – 1969 6c Botanical Congress (#1376-79) Combo First Day Covers - set of 2

Issued to salute the eleventh International Botanical Congress, this set of four stamps was the first devoted to flora from each of the four corners of the United States.  They were also the first to include Latin names.
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Issued to salute the eleventh International Botanical Congress, this set of four stamps was the first devoted to flora from each of the four corners of the United States.  They were also the first to include Latin names.