There are 2 titles associated with this firm.

@book{ wphp_14987
  author={Melvill,John},
  year={1789},
  title={Observations on the nature and properties of fixible air, and on the salutary effects of the aqua salubris, in preserving health, and preventing diseases. To which are added, Strictures on the Present Practice of Physic, Pointing out the Causes which greatly obstruct the Improvement of the Healing Art. Submitted to the attentive Consideration of the Public. By John Melvill, M.D. John-Street, Adelphi.},
  publisher={John Melvill \& },
  address={London},    }
@book{ wphp_10124
  author={,Eliza},
  year={1789},
  title={Adversity; or, the Tears of Britannia. A Poem. By a Lady.},
  publisher={James Kerby \& John Shepperson and Thomas Reynolds \& Benjamin White and Son},
  address={London},    }