Stamps of United States, 31 May 2016
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postage
2016, May 31 Views of Our Planets issue unwmk (no perf info) (8 stamps)
| - | forever | multi | Mercury (planet) (2016) | — | — | |
| - | forever | multi | Venus | — | — | |
| - | forever | multi | Earth | — | — | |
| - | forever | multi | Mars | — | — | |
| - | forever | multi | Jupiter | — | — | |
| - | forever | multi | Saturn | — | — | |
| - | forever | multi | Uranus | — | — | |
| - | forever | multi | Neptune | — | — |
2016, May 31 Pluto Explored! issue
| - | forever | multi | Pluto | — | — | |
| - | forever | multi | New Horizons | — | — |
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