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INDEX SEARCH RESULTS FOR: OPIUM
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 opium - history
  - in Crete and Egypt
  - in Roman empire
  - and 17th century injections
  - the Opium Wars
  - as medicine for babies
  - addiction
  - famous addicts
 Opium Wars
 Oporto - and the liberal uprising of 1820
  - in the War of the Two Brothers
 Opposition, in British politics
 opthalmoscope - history
  - and diabetes
  - retinal photography
 optic nerves - observed by Alcmaeon
 Opticks - by Newton
 optimism - in Candide
 opus anglicanum
 oracle - at Delphi
 oracle bones - and the Shang dynasty
 Oran - Allied landing in 1942
 Orange, House of - and the Netherlands
  - brief history
 Orange Free State - established in 1854
 Orangemen - and Orange
 Orange River Colony - self-governing
 Orange River Sovereignty - 1848-54
 Oranges and Lemons
 Orange Society - founded in 1795
 Orangia Unie - established in 1906
 oratorio - origin
  - and Handel in England
 Oratory in Rome - and oratorio
 orchestra - in Greek theatres
 Orczy, Baroness
 Order of the Strata - by William Smith
 orders of architecture - in Greece
 ORDERS OF KNIGHTOOD
 ordination - Orthodox and Catholic
 Ordnance Survey - established in 1791
  - brief account
 Ordovician period - identified and named
 Oregon - first settlers
  - statehood in 1859
 Oregon, USS - in 1898
 Oregon Trail - from 1843
 Oresteia - trilogy by Aeschylus
 Orfeo - by Monteverdi
 Orfeo ed Eurydice - by Gluck
 organ - musical instrument
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