Little Marian. Philadelphia: American Sunday-School Union, [ca. 1853-1857]. The American Sunday-School Union was a pioneer in the use of the shaped book format and chromolithography, competing directly with secular firms including McLoughlin Brothers. Little Marian serves as a sequel to the Pilgrim’s Progress-inspired children’s book Little Marian’s Pilgrimage, issued by the ASSU ca. 1852. The earlier ...