There are 3 titles associated with this firm.

@book{ wphp_9691
  author={Elfe,Anne},
  year={1809},
  title={Original Poems},
  publisher={Barrett \& Mark Willett \& Tudor and Farror \& John Cheese Watkins \& Evan Lewis \& John Bird \& James Roberts \& S. Davis \& William Sheppard},
  address={Chepstow},    }
@book{ wphp_692
  author={},
  year={1811},
  title={The Beauties of Carlo-Maria Maggi, Paraphrased: to which are added, Sonnets: by Mariana Starke, Author of the Widow of Malahar; The Tournament; Letters from Italy; &c.},
  publisher={},
  address={Exeter},    }
@book{ wphp_9074
  author={Layton,Jemima},
  year={1816},
  title={Spanish Tales, Translated From Le Sage, and Selected From Other Authors: Wherein are contained a description of Madrid, Grenada, Saragoza, Seville, Milan, Parma, Palermo, &c. &c. By Mrs. Frederick Layton. In Three Volumes.},
  publisher={John Hatchard [190 Piccadilly] \& Barrett \& John Deighton [Cambridge, 1784–1786; 1796–?]},
  address={London},    }