There are 3 titles associated with this firm.

Owenson , S. (1803). St. clair; or, the heiress of desmond. by s. o. London: Samuel Highley [24 Fleet] Edward Harding [98 Pall Mall] John Archer [Commercial Buildings, Dame Street]
Montolieu , M.H. (1803). The enchanted plants; fables in verse. inscribed to miss montolieu, and miss julia montolieu. London: Edward Harding [98 Pall Mall] Sylvester Harding [Pall Mall]