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Series: Washington Monument Commemorative Stones - U.S.
Washington Monument - Wikipedia
Washington Monument Commemorative Stones - Atlas Obscura
The Lost Gift Stones of the Washington Monument
History & Culture - Washington Monument (U.S. National Park Service)
Only on 7: Inside look at Washington Monument's historic stones…
The Little-Known Story of the First Washington Monument
Washington Monument | History, Height, Dimensions, Date,
Why is the Washington Monument two different colors?