There are 12 titles associated with this firm.

Heber, Reginald, Felicia Hemans, and Robert Pollok. The Poetical Works of Hemans, Heber and Pollok. Complete in one volume. Philadelphia: John Grigg, 1831.
Bray, Anna E. The Talba, or Moor of Portugal. A Romance. By Mrs. Bray, Author of "The White Hoods," "The Protestant," "Fitz of Fitz-Ford," &c. &c. In Two Volumes. New York: James and John Harper [Cliff Street], H.C. Carey and I. Lea, John Grigg, 1831.
Heber, Reginald, Felicia Hemans, and Robert Pollok. The Poetical works of Hemans, Heber and Pollok. Complete in one volume. Philadelphia: John Grigg, 1832.
Heber, Reginald, Felicia Hemans, and Robert Pollok. The Poetical Works of Hemans, Heber and Pollok. Complete in one volume. Philadelphia: John Grigg, 1833.
Heber, Reginald, Felicia Hemans, and Robert Pollok. The Poetical Works of Hemans, Heber and Pollok. Complete in one volume. Philadelphia: John Grigg, 1834.