There are 4 titles associated with this firm.

@book{ wphp_19085
  author={Porter,Anna Maria},
  year={1810},
  title={The lake of Killarney: a novel, in two volumes. By Anna Maria Porter, author of Octavia, Walsh Colville, &c. &c. ; [Four lines of Milton] ; Vol. I[-II},
  publisher={Thomas de Silver},
  address={Philadelphia},    }
@book{ wphp_14543
  author={Cuthbertson,Catherine},
  year={1812},
  title={Forest of Montalbano: a novel. In four volumes. By the author of "Santo Sebastiano," and "The romance of the Pyrenees."},
  publisher={Thomas and Robert Desilver \& Thomas Town},
  address={Philadelphia},    }
@book{ wphp_17096
  author={Cuthbertson,Catherine},
  year={1812},
  title={Forest of Montalbano: a novel. In four volumes. By the author of "Santo Sebastiano," and "The romance of the Pyrenees."},
  publisher={Thomas and Robert Desilver \& Thomas Town},
  address={Philadelphia},    }
@book{ wphp_16591
  author={Botsford,Margaret},
  year={1829},
  title={Viola; heiress of St. Valverde. An original romance. : To which is annexed a variety of original poetical pieces. By Mrs. Botsford. Authoress of Adelaide, Western Elysium, and Modern Piety. Second Edition.},
  publisher={Robert P. Desilver \& },
  address={Philadelphia},    }