There are 3 titles associated with this firm.

@book{ wphp_18907
  author={Opie,Amelia},
  year={1808},
  title={Adeline Mowbray; or, The mother and daughter. A tale, in two volumes. By Mrs. Opie.  First American Edition.},
  publisher={Joseph Milligan \& },
  address={Georgetown},    }
@book{ wphp_17331
  author={Edgeworth,Maria},
  year={1809},
  title={Tales of Fashionable Life: by Miss Edgeworth, Author of Practical Education, Belinda, The Parent's Assistant, &c. In Two Volumes. First American Edition.},
  publisher={Joseph Milligan \& },
  address={Georgetown},    }
@book{ wphp_17298
  author={Edgeworth,Maria},
  year={1809},
  title={The Parent's Assistant; or, Stories for Children. By Maria Edgeworth, Author of Practical Education, and Letters for Literary Ladies. In Three Volumes.},
  publisher={Joseph Milligan \& },
  address={Georgetown},    }