There are 5 titles associated with this person.

Heron, Mary. Miscellaneous. Poems, by Mary Heron. Newcastle upon Tyne: 1786.
Heron, Mary. Sketches of poetry. By Mary Heron, of Durham. Newcastle upon Tyne: 1786.
Heron, Mary. The conflict. A sentimental tale in a series of letters. Newcastle upon Tyne: 1790.
Heron, Mary. The conflict. A sentimental tale in a series of letters. London: s.n. [sine nomine], 1793.