There are 2 titles associated with this firm.

@book{ wphp_9653
  author={Jones,Harriet},
  year={1818},
  title={The Family of Santraile; or, The Heir of Montault. A Romance, in Four Volumes. By Harriot Jones, Author of Belmont Lodge, &c. &c. Second Edition.},
  publisher={T. Mason [Great Russell Street] \& Anthony King Newman and Co. \& },
  address={London},    }
@book{ wphp_31
  author={Edgeworth,Maria},
  year={1825},
  title={Tales and Miscellaneous Pieces. By Maria Edgeworth. In fourteen volumes.},
  publisher={Rowland Hunter \& Robert Baldwin, Charles Cradock, and William Joy \& Joseph Booker \& Harding, Triphook, and Lepard \& R. Scholey \& Robert Saunders \& Thomas Hamilton, William Adams, and Co. \& W. Simpkin and R. Marshall \& T. Mason [Great Russell Street] \& Anthony King Newman and Co. \& Longman, Hurst, Rees, Orme, Brown, and Green \& James Duncan \& Thomas Tegg [73 Cheapside] \& George Smith and Alexander Elder [Cornhill] \& },
  address={London},    }