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Source:
Colnect
Issued by:
Nicaragua
Function:
postage
Date:
5/15
/
1971
Issue:
Physical Laws and Mathematical Formulas
Denom:
30c
Color:
multicolored
Design:
Pythagoras
Watermark:
unwmk
Perf:
Catalog value:
Prev:
25c d=J. Napier
Next:
40c d=L. Boltzmann
External links:
Colnect 533759..em-Mathematics
