Titles by Langdon and Harker in BIBTEX format

There are 2 titles associated with this firm.

@book{ wphp_12693
  author={Usher,James},
  year={1823},
  title={A New Version of the Psalms; Principally from the Text of Bishop Horne. By James Usher.},
  publisher={},
  address={London},    }

@book{ wphp_12603
  author={Usher,James},
  year={1824},
  title={A Version of the Messiah, a Sacred Oratorio . . . .},
  publisher={},
  address={London},    }