There are 2 titles associated with this firm.

@book{ wphp_24736
  author={Sharp,Jane},
  year={1724},
  title={The compleat midwife's companion: or, the art of midwifry improv'd. Directing child-bearing women how to order themselves in their conception, breeding, bearing, and nursing of children. In six books, divided into several chapters from each book. With physical prescriptions for each disease incident to the female sex, whether virgins, wives or widows: adapted chiefly for their use. The third edition. By Mrs. Jane Sharp, practitioner in the art of midwifry above forty years.},
  publisher={John Marshall [Gracechurch]},
      }
@book{ wphp_24189
  author={Sharp,Jane},
  year={1725},
  title={The compleat midwife's companion: or, the art of midwifry improv'd. Directing child-bearing women how to order themselves in their conception, breeding, bearing, and nursing of children. In six books, divided into several chapters from each book. With physical prescriptions for each disease incident to the female sex, whether virgins, wives or widows: adapted chiefly for their use. The fourth edition. By Mrs. Jane Sharp, practitioner in the art of midwifry above forty years.},
  publisher={John Marshall [Gracechurch]},
  address={London},    }