There are 7 titles associated with this firm.

Thicknesse, Ann. The school for fashion, in two volumes. By Mrs. Thicknesse. London: John Debrett [179 Piccadilly], Samuel William Fores [50 Piccadilly], 1800.
Cottin, Sophie R. Malvina, by Madame C****, authoress of Clare D'Albe, and Amelia Mansfield. Translated from the French, by Miss Gunning, in four volumes. London: Robert Dutton [Gracechurch Street], Thomas Hurst [Paternoster], Clement Chapple [66 Pall Mall], 1803.
Cottin, Sophie R. Malvina, by Madame C****, authoress of Clare D'Albe, and Amelia Mansfield. Translated from the French, by Miss Gunning, in four volumes. London: Thomas Hurst [Paternoster], Clement Chapple [66 Pall Mall], Robert Dutton [Gracechurch Street], 1804.
de Montolieu, Isabelle. Tales, by Madame de Montolieu, author of Caroline of Lichtfield. In Three Volumes. London: Clement Chapple [66 Pall Mall], 1805.
Dorset, Catherine A. T. The lioness's ball, being a companion to the Lion's masquerade. London: William Darton and Joseph Harvey [Gracechurch], John Harris [1802-1819, 1824-1843], Clement Chapple [66 Pall Mall], B. Tabart, 1807.
Cockle, Mary. The fishes grand gala: a companion to The "peacock at home," &c. &c. By Mrs. Cockle, Author of the Juvenile Journal, &c. London: William Darton and Joseph Harvey [Gracechurch], John Harris [1802-1819, 1824-1843], Clement Chapple [66 Pall Mall], B. Tabart, 1808.
St. Victor, Helen. The Ruins of Rigonda; or, The Homicidial Father. A Romance, in three volumes. By Helen St. Victor. London: Clement Chapple [66 Pall Mall], 1808.