Oliphant’s Land of Gilead
Oliver (L. P.), Megalithic Structures of the Channel Islands, their History and Analogies, 1870
Oliver’s Antiquities of Masonry
Oliver’s History of Beverley
Oliver’s History of Initiation into Ancient Rites
Oliver’s Signs and Symbols
Oliver’s Star in the East
O’Neill’s Fine Arts of Ancient Ireland
Oort’s Worship of Baalim
Orme’s Historical Fragments