There are 2 titles associated with this firm.

@book{ wphp_763
  author={Kelly,Isabella},
  year={1823},
  title={Memoir of the late Mrs. Henrietta Fordyce, relict of James Fordyce, D.D. Containing original letters, anecdotes, and pieces of poetry. To which is added a sketch of the life of James Fordyce, D.D.},
  publisher={Thomas Hurst, George Robinson and Co. [Cheapside] \& Archibald Constable [Princes Street] \& C. Duffield \& C. Duffield},
  address={London},    }
@book{ wphp_763
  author={Kelly,Isabella},
  year={1823},
  title={Memoir of the late Mrs. Henrietta Fordyce, relict of James Fordyce, D.D. Containing original letters, anecdotes, and pieces of poetry. To which is added a sketch of the life of James Fordyce, D.D.},
  publisher={Thomas Hurst, George Robinson and Co. [Cheapside] \& Archibald Constable [Princes Street] \& C. Duffield \& C. Duffield},
  address={London},    }