There are 4 titles associated with this firm.

@book{ wphp_835
  author={Murray,Sarah},
  year={1803},
  title={A Companion and Useful Guide to the Beauties in the Western Highlands of Scotland, and in the Hebrides: To which is added, a description of part of the main land of Scotland, and of the isles of Mull, Ulva, Staffa, I-Columbkill, Tirii, Coll, Eigg, Skye, Raza, and Scalpa. By the Hon. Mrs. Murray, of Kensington. Vol. II.},
  publisher={},
  address={London},    }
@book{ wphp_13409
  author={Murray,Sarah},
  year={1805},
  title={A Companion and Useful Guide to the Beauties in the Western Highlands of Scotland, and the Hebrides. To which is added, a description of part of the main land of Scotland, and of the Isles of Mull, Ulva, Staffa, I-Columbkill, Tirii, Coll, Eigg, Skye, Raza, and Scalpa.. By the Hon. Mrs. Murray, of Kensington. Vol. II. The second edition.},
  publisher={},
  address={London},    }
@book{ wphp_292
  author={Murray,Sarah},
  year={1810},
  title={A Companion and Useful Guide to the Beauties of Scotland, and the Hebrides, to the Lakes of Westmoreland, Cumberland, and Lancashire; and to the Curiosities in the District of Craven, in the West Riding of Yorkshire. Also a Description of Part of Scotland, particularly of the Highlands, and of the Isles of Mull, Ulva, Staffa, I-Columbkill, Tirii, Coll, Eigg, Rume, Skye, Raza, and Scalpa. To which is now added, An account of the new roads in Scotland, and of a beautiful cavern lately discovered in the Isle of Skye. By the Hon. Mrs. Murray Aust, of Kensington. In two volumes.—Vol. I. The third edition.},
  publisher={},
  address={London},    }
@book{ wphp_11013
  author={Cumberland,Richard},
  year={1813},
  title={The Posthumous Dramatick Works of the late Richard Cumberland, Esq. In two volumes.},
  publisher={George and William Nicol [58 Pall Mall] \& },
  address={London},    }