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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 ]
{{#atag:gallery| File:1683.jpg|Anonymous, Two Children in an Arbor of Flowers, 19th century|link=Category:Keywords File:1842.jpg|George Harvey, A Morning Rainbow, A Composition on the Grounds of R. Donaldson, Esq., 1840–50|link=Category:Places File:2241.jpg|James Frothingham, Manasseh Cutler, 1820|link=Category:People |mode=packed |heights=320px }}