lower center in plate: ENRAG'D MONSTER / Publish'd Dec.r 8 1778 by I. Mortimer
(William Weston Gallery, London, 28 February 1985); Donald Vogler, Portland, OR; gift to NGA, 2017.
- Sunderland, John. "John Hamilton Mortimer: His Life and Works," Walpole Society 52 (1986): no. 140.15
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