Image: Palomar Mountain Observatory 3c 1948 issue U.S. stamp
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Description: Palomar Mountain Observatory 3-cent 1948 issue U.S. stamp.
Title: Palomar Mountain Observatory 3c 1948 issue U.S. stamp
Credit: U.S. Postal Service; National Postal Museum: Palomar Mountain Observatory Issue
Author: Bureau of Engraving and Printing.
Usage Terms: Public domain
License: Public domain
Attribution Required?: No
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