IMAGES:  British Museum Image Edward Orme after Singleton

https://www.britishmuseum.org/collection/object/P_1953-0411-84

IMAGES:   Athenaeum 1859 article about the copyright court case mentions Wallis, Singleton etc

https://babel.hathitrust.org/cgi/pt?id=umn.31951001922959n&view=1up&seq=855&q1=chatterton

IMAGES:  Typewritten copy of the above.

http://www.engl.duq.edu/servus/PR_Critic/A25jun59.html