There are 2 titles associated with this firm.

@book{ wphp_25179
  author={Sewell,George},
  year={1728},
  title={The tragedy of Richard I. King of England. To which are annexed, some other papers. By George Sewell, M. D. Late of Hampstead All faithfully published from his original manuscripts, by his brother.},
  publisher={Gregory Sewell \& },
  address={London},    }
@book{ wphp_25180
  author={Sewell,George},
  year={1728},
  title={The tragedy of Richard I. King of England. To which are annexed, some other papers. By George Sewell, M. D. Late of Hampstead All faithfully published from his original manuscripts, by his brother.},
  publisher={Gregory Sewell \& },
  address={London},    }