There are 4 titles associated with this person.

Falconar, Maria, and Harriet Falconar. Poems on slavery: by Maria Falconar, aged 17, and Harriet Falconar, aged 14. London: Joseph Johnson and Co., John Murray I [Fleet Street], Thomas and John Egerton, 1788.
Falconar, Harriet, and Maria Falconar. Poems, by Maria and Harriet Falconar. London: Joseph Johnson, Thomas and John Egerton, 1788.
Falconar, Harriet, and Maria Falconar. Poems, by Maria and Harriet Falconar. The second edition. London: Joseph Johnson and Co., Thomas and John Egerton, 1788.