oaths [3 subentries]

O'Bryen (O'Brien), Capt. Richard [3 subentries]

Observations on the Manufactures, Trade, and Present State of Ireland (Lord Sheffield) [1 subentry]

Observations sur les colonies Françoises de l'Amérique (Baron Mahy de Cormeré) [1 subentry]

Occacock Island, N.C. [1 subentry]

odometer [1 subentry]

Oeuvres (Pierre Louis Moreau de Maupertius) [1 subentry]

Ogden, Mr. [1 subentry]

Ohio [1 subentry]

Ohio Company [3 subentries]

Ollivier, Mr. [1 subentry]

Ollivier, Mrs. [1 subentry]

On Toleration (John Locke) [1 subentry]

Opera (Athenagoras) [1 subentry]

Oporto, Portugal [2 subentries]

Oran, Algiers [2 subentries]

Origen [2 subentries]

Orléans, Louis Philippe Joseph, Duc d' [1 subentry]

Orsai, M. d' [1 subentry]

Osborne, Mr. [1 subentry]

Osmont, Louis [1 subentry]

Oswegatchie [1 subentry]

Oswego [1 subentry]

Othello (William Shakespeare) [1 subentry]

Otis, Samuel A. [1 subentry]

Ottawa Indians [1 subentry]

Ouioctanon Indians [1 subentry]

Owings, David [1 subentry]

Ozorkow, Poland [2 subentries]