These publications continued to represent an important part of the output of the press until the mid-1790s. There are examples of all of these categories of literature which contain John Marshall's imprint, but the extent of his involvement is difficult to ascertain as many of these works were undated and carried the imprint 'Printed and sold in Aldermary Churchyard'. During the 1770s Richard had begun to publish children's books as a sideline, and this aspect of the work was greatly expanded by John and his partners after 1780. Marshall recruited a number of new female authors and published some of the most important children's literature of the time, notably: All of these works all went through several editions; some went through innumerable editions, and remained in print well into the 19th century – such as "Cobwebs to catch flies" or "The life and perambulation of a mouse", which was praised by Sarah Trimmer and Mary Wollstonecraft alike. Marshall's catalogue for May 1793 listed 113 children's book titles, two children's magazines, as well as various teaching aids. Marshall ventured into the publication of teaching aids c.1785 with Mrs Teachwell's "Set of Toys, for enabling Ladies to instill the Rudiments of Spelling, Reading, Grammar, and Arithmetic, under the Idea of Amusement", which was accompanied by an instruction manual 'The Art of teaching in sport. Other teaching aids listed in the 1793 catalogue were "Miss Cowley's Pocket Sphere" (for teaching geography), and "Alphabetical Cards for enticing Children to acquire an early Knowledge of their Letters". A dissected map of England, (a forerunner of modern Jigsaw puzzles) was also advertised by him between 1795 and 1801. In 1787 the business opened a retail bookshop at 17 Queen Street, Cheapside (hitherto the Aldermary Churchyard premises had principally served as a wholesale supplier and printing office). The shop seems to have closed about 1799 when the business appears to have suffered a financial setback following his break with Hannah More. On four occasions during his career Marshall attempted to start periodicals for children. These were:  Marshall was the London printer and publisher of Hannah More's Cheap Repository Tracts between 1795 and December 1797. Following a dispute with More in 1797 Marshall published his own series of Cheap Repository Tracts until 1799. Following the formation of the Religious Tract Society in 1799 Marshall abandoned tract publishing and concentrated on new forms of publication for children.