There are 2 titles associated with this firm.

@book{ wphp_14805
  author={Mavor,William Fordyce},
  year={1800},
  title={The British tourists; or Traveller’s pocket companion, through England, Wales, Scotland, and Ireland. Comprehending the most celebrated tours in the British islands. By William Mavor, LL.D.},
  publisher={Elizabeth Newbery},
  address={London},    }
@book{ wphp_12872
  author={Smythies,Susan},
  year={1801},
  title={The history of a pin, as related by itself. Interspersed with a variety of anecdotes, Pointing out to the Youth of both Sexes, the Superiority of a generous Mind over one that is narrow and uncultivated. By the author of the brothers, a tale for children, &c.},
  publisher={Elizabeth Newbery \& },
  address={London},    }