There are 3 titles associated with this firm.

Costello, Louisa Stuart. The Maid of the Cyprus Isle, and Other Poems. By Louisa S. Costello. London: Sherwood, Neely, and Jones, Edmund Lloyd [23 Harley Street], John Sharpe [Piccadilly], James Harper and Co. [London], Richard Rees, John Walker VI, 1815.
Costello, Louisa Stuart. The Maid of the Cyprus Isle, and Other Poems. By Louisa S. Costello. Second Edition. London: Sherwood, Neely, and Jones, Edmund Lloyd [23 Harley Street], John Sharpe [Piccadilly], James Harper and Co. [London], Richard Rees, John Walker VI, 1815.
Downing, Harriet. 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], 1816.