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Source:
Colnect
Issued by:
Nicaragua
Function:
postage
Date:
5/15
/
1971
Issue:
Physical Laws and Mathematical Formulas
Denom:
40c
Color:
multicolored
Design:
L. Boltzmann
Watermark:
unwmk
Perf:
Catalog value:
Prev:
30c d=Pythagoras
Next:
1cord d=K. Ziolkowski
External links:
Colnect 533767..on-Mathematics
Record of changes
