There are 9 titles associated with this firm.

Robertson, Mrs.. Florence: or The Aspirant. A Novel, in three volumes. London: Whittaker, Treacher, and Arnot, 1829.
Bryan, Mary. Longhollow; A Country Tale. By Mrs. Bryan Bedingfield. In three volumes. London: Whittaker, Treacher, and Arnot, 1829.
Curling, Mary A. Poetical Pieces . . . With Some Additional Pieces. By M. A. Curling. London: Whittaker, Treacher, and Arnot, 1831.
Edgeworth, Maria. Tales And Novels by Maria Edgeworth. In Eighteen Volumes. London: Joseph Booker, W. Simpkin and R. Marshall, John Murray II [Albemarle], Anthony King Newman and Co., George Smith, Alexander Elder and Co., E. Hodgson, Robert Baldwin and Charles Cradock, Frances Houlston and Son [Wellington], Whittaker, Treacher, and Arnot, J. Bain, R. Mackie, Renshaw and Rush, G. and J. Robinson [Liverpool], Thomas Tegg [73 Cheapside], John Templeman [1830-9], 1832.
The Parent's Poetical Anthology: Being a Selection of English Poems Primarily Designed to Assist in Forming the Taste and the Sentiments of Young Readers. Third edition with additions. London: W. Simpkin and R. Marshall, Longman, Rees, Orme, Brown, and Green, John Richardson [Royal Exchange], Robert Baldwin and Charles Cradock, Whittaker, Treacher, and Arnot, John, George, and Francis Rivington, John Souter [St. Paul's Churchyard], 1832.
Shelley, Mary, W., John R. Chorley, Amelia G. Smyth, Felicia Hemans, William Howitt, Thomas Roscoe, W. H. Harrison, Mary Howitt, Andrew Norton, Hartley Coleridge, Francis Wrangham, Mary A. Browne, Reverend T. Raffles, H. C. Deakin, L. A. J. Mordacque, J. Merritt, John Bowring, W. G. Clarke, Gent Mark Spencer, Priscilla M. W. Watts, Ann Butler, Anne M. Moir, R. Millhouse, Catherine Parry, M. D. La Claverie, Signor Grimaldi, and Rose D. Lawrence. The Winter's Wreath for MDCCCXXXII. London: Whittaker, Treacher, and Arnot, George Smith, 1832.
Child, Lydia M. F. The Western Coronal; a Collection of Pieces, Written at Various Times. ... Second edition, revised and enlarged. By Mrs. Child. Glasgow: Thomas Oliver and George Boyd [High Street], Whittaker, Treacher, and Arnot, John Reid and Co., 1833.