There are 5 titles associated with this firm.

Hemans, Felicia. Hymns on the Works of Nature. For the Use of Children. By Mrs. Felicia Hemans. London: John Mardon [St. Martin's-Le-Grand], 1833.
Follen, Eliza L. C. Sequel to "The well-spent hour", or, The birth-day. By the author of the "Well-spent hour," &c, &c. London: John Mardon [St. Martin's-Le-Grand], 1833.
Follen, Eliza L. C. The Sceptic. By Mrs. Follen, Author of ‘The Well-Spent Hour,’ &C. London: Simpkin, Marshall and Co., John Mardon [St. Martin's-Le-Grand], 1835.
Sedgwick, Catharine M. Home. By Miss Sedgwick, Author of “Redwood,” “Hope Leslie,” &c. London: Simpkin, Marshall and Co., 1836.