There are 2 titles associated with this firm.

@book{ wphp_14711
  author={Harman,Isaac},
  year={1775},
  title={A familiar epistle to a free doctor, Remarkable for his singular Ingenuity in the Construction of new invented Rules for Important Discoveries; his Commentary on a Letter from the Mansions above: And also for his being a considerable Dealer in Envy, Malignity, Detraction, &c. By Isaac Harman.},
  publisher={},
  address={London},    }
@book{ wphp_7299
  author={Howard,Sarah},
  year={1783},
  title={Thoughts on female education: with advice to young ladies. By Sarah Howard. Addressed to her pupils.},
  publisher={James Mathews [Matthews] \& John Breadhower \& William Harding \& Thomas Whitewood},
  address={London},    }