Skimming the article, the pictorial examples are from LC. They have quite a few panoramic maps digitized: https://www.loc.gov/collection/panoramic-maps/about-this-collection/ .
Joel Kovarsky
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The Hidden History of America's 19th Century Mania for Panoramic PrintsItinerant artists made almost 5,000 views of 2,400 different places.
By Sarah Laskow MAY 11, 2016 of Atlas Obscura
...
These views were one of America’s first fads. These panoramic maps were hand-drawn from an imaginary viewpoint, elevated high above the streets, revealing the shape, situation and details of America’s growing cities. They were hugely popular, “almost a mania,” according to one contemporary writer.
...
-Angie
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