card-mounted photographs

n. A general class of photographic prints attached to a standard-sized sheet of cardboard.

Notes

In addition to cabinet cards and cartes-de-visite, less common sizes include boudoir (8½ × 5.½ inches, introduced in the 1890s), imperial (10 × 7 inches, introduced in the 1890s), promenade (7 or 7½ × 4 inches, introduced ca. 1874), and Victoria (5 × 3½ inches, introduced in the 1870s).