Prints are a good source for visual evidence. See such examples as:
The Other Hogarth by Bernadette Fort; Angela Rosenthal (Editor)
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ISBN: 0691010129
Publication Date: 2001-05-21
Crime and the Law in English Satirical Prints 1600-1832 by J. A. Sharpe
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ISBN: 0859641767
Publication Date: 1986-08-01
This study includes 133 full page prints along with short commentaries.
Image Sources
ARTstor
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A digital library that provides access to thousands of digital images derived from a variety of museum, library and archival collections. Images support a variety of disciplines including architecture, painting, sculpture, photography, decorative arts, and design. Coverage varies.
Oxford University makes these digital collections available open access.
Note in particular:
•18th Century Entertainment Ephemera,
•John Johnson Collection [advertisements, political cartoons, etc. from the 18th, 19th, and early 20th centuries]