There are 4 titles associated with this firm.

@book{ wphp_8547
  author={Ventum,Harriet},
  year={1801},
  title={Justina; or, The History of a Young Lady. In Four Volumes. By Harriet Ventum, author of Selina, &c. &c.},
  publisher={John Badcock \& },
  address={London},    }
@book{ wphp_8548
  author={Ventum,Harriet},
  year={1802},
  title={Justina; or, the History of a Young Lady. By Harriet Ventum, author of Selina, &c. &c.},
  publisher={John Badcock \& },
  address={London},    }
@book{ wphp_10413
  author={Ventum,Harriet},
  year={1802},
  title={Surveys of nature: a sequel to Mrs. Trimmer's introduction being familiar descriptions of some popular subjects in natural philosophy, adapted to the capacities of children. By Harriet Ventum.},
  publisher={John Badcock \& B. Tabart \& },
  address={Canterbury},    }
@book{ wphp_8626
  author={Ker,Anne},
  year={1804},
  title={Modern Faults, A Novel, Founded on Facts. By Mrs. Ker, author of "The Heiress di Montalde." &c. &c. &c. In Two Volumes.},
  publisher={J. Ker \& },
  address={London},    }