There are 7 titles associated with this firm.

Gessner, Salomon. The death of Abel, in five books. Attempted from the German of Mr. Gessner. The thirteenth edition. London: John Mozley, Walker and Roberts, S. Toplis and J. Bunney [St. Paul's], 1779.
Montagu, Mary W. The poetical works of the Right Honourable Lady M---y W------y M------e. A new edition. London: W. Osborne and T. Griffin, John Mozley, 1785.