oats [2 references]

Observations on Animal Electricity (Dr. John Vaughan) [1 reference]

“Observations on some passages in the Discourse of Sir William Scott” (Thomas Paine) [2 references]

Observations on the Climate in Different Parts of America (Hugh Williamson) [1 reference]

Observations on the Produce of the Income Tax (Henry Beeke) [1 reference]

Observations Pratiques sur les Bêtes à Laine (Jean Marie Heurtault de Lamerville) [2 references]

“Observator” (Hamilton pseudonym) [2 references]

Oche Haujo [See redirect]

Odes (Horace) [2 references]

Œconomy of Human Life [1 reference]

Oeuvres (Jean Jacques Rousseau) [1 reference]

Oeuvres complètes (Claude Adrien Helvétius) [1 reference]

Oeuvres complètes (Frederick II) [1 reference]

Ogle, Benjamin [2 subentries]

Ohio [1 subentry + 1 “see also” entry]

oil, cooking [1 reference]

Olive Branch (ship) [1 reference]

olives [2 references]

Olmütz (Olomouc), Moravia [2 references]

“On the Jacobinism of the English at Sea” (Thomas Paine) [4 references]

Orange Co., Va. [5 references]

Orozco [See redirect]

Orr, Alexander Dalrymple [1 reference]

Orrery, Earl of [See redirect]

Osgood, Samuel [2 references]

Otis, Harrison Gray [1 reference]

Otis, Samuel A. [2 subentries]

Ottoman Empire [1 reference]

Ovid [1 subentry]

Owen, John [1 reference]

Owen, William (London printer) [1 reference]

Oxford University [1 reference]