There are 2 titles associated with this firm.

@book{ wphp_20516
  author={Williams,Helen Maria},
  year={1791},
  title={Letters on the French Revolution, written in France, in the summer of 1790, to a friend in England; containing, various anecdotes relative to that interesting event, and memoirs of Mons. and Madame Du F--. By Helen Maria Williams. The First American Edition.},
  publisher={},
  address={Boston},    }
@book{ wphp_20516
  author={Williams,Helen Maria},
  year={1791},
  title={Letters on the French Revolution, written in France, in the summer of 1790, to a friend in England; containing, various anecdotes relative to that interesting event, and memoirs of Mons. and Madame Du F--. By Helen Maria Williams. The First American Edition.},
  publisher={},
  address={Boston},    }