My drop-in-the-sea contribution to Wikipedia has been centered around still photography, optics, computing (esp, microcomputer hacker culture), automobiles, physics, digital signal processing, skiing, historical weights and measures, geography of Norway, current events and handling of geographical coordinates.
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The 1928 series of United States Note, the first small-size banknotes issued in the United States. The $2 and $5 bills in this series, which replaced the large-sized notes that had been used since the Civil War, were introduced in 1929, though $1 notes were issued in 1933 in response to the Great Depression. The obverses of these bills were similar to contemporary Federal Reserve Notes, but can be readily differentiated by their red (not green) U.S. Treasury Seals and serial numbers.
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