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[http://www.nga.gov/content/ngaweb/research/casva/research-projects.html A Project of the National Gallery of Art, Center for Advanced Study in the Visual Arts ]
https://archive.org/stream/historicalcollec00bar#page/301/mode/1up
"A small enclosed common, oval in its form, is in the central part of the area, around which the public buildings are situated; it is newly set out with shade trees, and will add to the beauty of the place." Barber (1844): 301.