There are 3 titles associated with this person.

Downing , H. (1816). Mary; or, female friendship: a poem, in twelve books. by harriet downing. London: James Malcott Richardson. Thomas and Joseph Allman [Princes St] James Harper and Co. [London]
Downing , H. (1830). The bride of sicily. a dramatic poem, by harriet downing. London: Thomas Hurst, Edward Chance, and Co. John Sams.