I came across this quite large broadside (17.5 x 11 inches) of a rather famous poem in anti-slavery literary circles (it has been anthologized often in the past 20 years). The Sorrows of Yamba, Or The Negro Woman’s Lamentation (1795). The poem was published (and some think, entirely written) by the prolific Hannah More in her popular “Cheap Repository” tract series. A nice, long article on its authorship and significance is available here by a scholar at Boston College.
There are two states of the broadside (in 3 columns), copies of which are fairly scarce: three are in the Bodleian (Oxford), and others are at Cornell University, the Huntington Library (CA), and the New York Public Library.