The US Mint has apparently been adding some content to their archives search. In particular I found some press releases from the 1970s containing information which would be hard to locate anywhere else.
From the web page:
The information presented in this section includes a portion of the larger United States Mint Historical Reference Collection. Over time, the information available in the Archives will offer a unique timeline of numismatic history, ranging from the late 18th Century to the present. Some examples of archival materials include legislation, press releases, annual report excerpts, and coin images.
Wayne Homren, Editor
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