There are 3 titles associated with this firm.

Young, Mary Julia. Genius and fancy; or, dramatic sketches. By a lady. London: Henry Delahoy Symonds [Paternoster Row], John Gray, 1791.
Young, Mary Julia. Genius and fancy; or, dramatic sketches. By a lady. London: Henry Delahoy Symonds [Paternoster Row], John Gray, 1795.