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1 to 2 of 2
Nicaragua
postage
1971
, May 15
Physical Laws and Mathematical Formulas issue
unwmk
(no perf info)
-
30c
multi
Pythagoras
San Marino
1982
, Apr 21
Pioneers of Science issue
-
pioneers of science
-
1000l
multi
Pythagoras
1 to 2 of 2