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1971, May 15 Physical Laws and Mathematical Formulas issue (no perf info) (10 stamps)

-	10c	multi	w. unwmk
-	15c	multi	Isaac Newton, w. unwmk
-	20c	multi	Albert Einstein, w. unwmk
-	25c	multi	J. Napier, w. unwmk
-	30c	multi	Pythagoras, w. unwmk
-	40c	multi	L. Boltzmann, w. unwmk
-	1cord	multi	K. Ziolkowski	—	—
-	1cord	multi	Louis de Broglie, w. unwmk
-	2cord	multi	J. C. Maxwell, w. unwmk
-	2cord	multi	Archimedes, w. unwmk

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