There are 4 titles associated with this firm.

@book{ wphp_13851
  author={Diderot,Denis and Melchior,Friedrich},
  year={1815},
  title={Historical & Literary Memoirs and Anecdotes, Selected from the correspondence of Baron de Grimm and Diderot with the Duke of Saxe-Gotha, and many other distinguished persons, between the years 1753 and 1790. Translated from the French. Second edition. In four volumes.},
  publisher={Henry Colburn [Conduit Street] \& },
  address={London},    }
@book{ wphp_15202
  author={Lichtenstein,Martin Heinrich Carl},
  year={1815},
  title={Travels in Southern Africa, in the years 1803, 1804, 1805, and 1806, by Henry Lichtenstein, Doctor in Medicine and Philosophy, and Professor of Natural History in the University of Berlin; Member of several learned societies; and formerly in the Dutch service at the Cape of Good Hope. Translated from the Original German, by Anne Plumptre. Vol. II},
  publisher={Henry Colburn [Conduit Street] \& },
  address={London},    }
@book{ wphp_13346
  author={Chapone,Hester Mulso and Gregory,John and Pennington,Sarah},
  year={1821},
  title={Letters on the Improvement of the Mind. Addressed to a Lady. By Mrs. Chapone. A Father's Legacy to his Daughters. By Dr Gregory. A Mother's Advice to her Absent Daughters. By Lady Pennington. With Lives of the Authors.},
  publisher={Thomas Tegg [111 Cheapside] \& William Oliphant \& Waugh and Innes [1818-25] \& James Robertson [Parliament Square] \& William Whyte and Co. \& Fairbairn and Anderson \& Macredie, Skelly, and Co. \& John Bell and John Bradfute [6 Parliament Close] \& John Robertson \& Stirling & Slade},
  address={Edinburgh},    }
@book{ wphp_9259
  author={Ritchie,Ann},
  year={1823},
  title={Precipitance: A Highland Tale. By a lady. In two volumes.},
  publisher={},
  address={Edinburgh},    }