Airmail - Physical Laws and Mathematical Formulas 1971
Now showing: Nicaragua - Postage stamps - 1971 - Airmail - Physical Laws and Mathematical Formulas - 5 stamps.
1971
Airmail - Physical Laws and Mathematical Formulas
15. May WM: None Engraving: De La Rue. Perforation: 13
![[Airmail - Physical Laws and Mathematical Formulas, type AIL]](https://swmedia-4cd6.kxcdn.com/media/catalogue/Nicaragua/Postage-stamps/AIL-s.jpg)
![[Airmail - Physical Laws and Mathematical Formulas, type AIM]](https://swmedia-4cd6.kxcdn.com/media/catalogue/Nicaragua/Postage-stamps/AIM-s.jpg)
![[Airmail - Physical Laws and Mathematical Formulas, type AIN]](https://swmedia-4cd6.kxcdn.com/media/catalogue/Nicaragua/Postage-stamps/AIN-s.jpg)
![[Airmail - Physical Laws and Mathematical Formulas, type AIO]](https://swmedia-4cd6.kxcdn.com/media/catalogue/Nicaragua/Postage-stamps/AIO-s.jpg)
![[Airmail - Physical Laws and Mathematical Formulas, type AIP]](https://swmedia-4cd6.kxcdn.com/media/catalogue/Nicaragua/Postage-stamps/AIP-s.jpg)
| No. | Type | D | Color | Description |
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| 1668 | AIL | 25C | multicoloured | Napier's Law, logarithms | 0.27 | - | 0.27 | - | USD |
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| 1669 | AIM | 30C | multicoloured | Pythagorean theorem | 0.27 | - | 0.27 | - | USD |
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| 1670 | AIN | 40C | multicoloured | Boltzmann equation | 0.27 | - | 0.27 | - | USD |
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| 1671 | AIO | 1Cord | multicoloured | de Broglie hypothesis | 0.81 | - | 0.27 | - | USD |
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| 1672 | AIP | 2Cord | multicoloured | Archimedes’ principle | 1.08 | - | 0.81 | - | USD |
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| 1668‑1672 | 2.70 | - | 1.89 | - | USD |
