There are 2 titles associated with this firm.

@book{ wphp_11629
  author={Ballantyne,Hermione},
  year={1832},
  title={The Kelso Souvenir: Or, Selections from Her Scrap-book. (Entirely Original.) By a Lady.},
  publisher={William Blackwood and Sons \& Walter Grieve \& },
  address={Edinburgh},    }
@book{ wphp_1396
  author={Ballantyne,Hermione},
  year={1835},
  title={Seymour, or the Man of Mystery. A Romance of the Seventeenth Century. By A Lady: In Two Volumes.},
  publisher={},
  address={Jedburgh},    }