Now showing: United States - Postage stamps - 1948 - Palomar Mountain Observatory - 1 stamps.
30. August WM: None Perforation: 10½ x 11
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![[Palomar Mountain Observatory, type QE]](https://swmedia-4cd6.kxcdn.com/media/catalogue/United-States/Postage-stamps/QE-s.jpg)
