There are 3 titles associated with this firm.

@book{ wphp_10922
  author={Stewart,Elizabeth M.},
  year={1834},
  title={The Shrine, or Sketches of Sacred Biography, in Verse. By Elizabeth M. Stewart.},
  publisher={},
  address={London},    }
@book{ wphp_1054
  author={Roberts,Emma},
  year={1835},
  title={Scenes and Characteristics of Hindostan, with Sketches of Anglo-Indian Society. By Emma Roberts, Author of "Memoirs of the Rival House of York and Lancaster," "Oriental Scenes," &c. &c. In Three Volumes.},
  publisher={William Houghton Allen & Co.},
  address={London},    }
@book{ wphp_14578
  author={Roberts,Emma},
  year={1837},
  title={Scenes and Characteristics of Hindostan, with Sketches of Anglo-Indian Society. By Emma Roberts, Author of "Memoirs of the Rival House of York and Lancaster," "Oriental Scenes," &c. &c. Second Edition. In Two Volumes.},
  publisher={William Houghton Allen & Co. \& },
  address={London},    }