There are 3 titles associated with this person.

Egerton, Harriet C. Elizabeth's Poems; or, Original Pieces for Children. London: John Marshall [Fleet Street], 1820.
Egerton, Harriet C. Outlines of Irish history: written for the use of young persons. London: John Harris [1802-1819, 1824-1843], 1829.
Egerton, Harriet C. Outlines of Irish history: written for the use of young persons. London: John Harris [1802-1819, 1824-1843], 1835.