There are 2 titles associated with this firm.

@book{ wphp_1563
  author={Smyth,Agnes},
  year={1790},
  title={An extract of the life, death, and spiritual experience, of Mrs. Agnes Smyth, whose spirit returned unto God who gave it, on the 22d of May 1783, in the 28th year of her Age},
  publisher={},
  address={London},    }
@book{ wphp_636
  author={Bailey,Mary},
  year={1833},
  title={Reflections, Doctrinal, Practical and Devotional, upon the Litany of the Church of England.},
  publisher={Messrs. Mathews \& W. Simpkin and R. Marshall \& },
  address={Ballingdon},    }