| The Columbia Encyclopedia, Sixth Edition. 2001-07. |
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| aphid to Arboleda, Julio |
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| aphid |
| aphorism |
| aphotic zone |
| Aphrah |
| Aphrodite |
| Apia |
| Apianus, Petrus |
| Apicius, Marcus Gabius |
| Apis |
| Apo, Mount |
| apocalypse |
| apocrine gland |
| Apocrypha |
| Apodaca, Juan Ruiz de |
| apogee |
| Apollinaire, Guillaume |
| Apollinarianism |
| Apollinaris Sidonius |
| Apollo |
| Apollo Belvedere |
| Apollodorus, Athenian painter |
| Apollodorus, Greek scholar |
| Apollodorus of Damascus |
| Apollonia |
| Apollonius |
| Apollonius of Perga |
| Apollonius of Tralles |
| Apollonius of Tyana |
| Apollonius Rhodius |
| Apollos |
| Apollo space program |
| Apollyon |
| apology |
| apoplexy |
| apostasy |
| apostle |
| Apostle Islands |
| Apostolic Constitutions |
| apostolic delegate |
| apostolic succession |
| apostrophe, in punctuation |
| apostrophe, figure of speech |
| apothecaries weight |
| apotheosis |
| Appalachia |
| Appalachian Mountains |
| Appalachian National Scenic Trail |
| Appalachian Trail |
| Appaloosa horse |
| apparent magnitude |
| apparent solar time |
| apparition |
| appeal |
| Appel, Karel |
| Appelfeld, Aharon |
| appendix |
| Appenzell |
| Appert, Nicolas |
| Apphia |
| Appia, Adolphe |
| Appian |
| Appiani, Andrea |
| Appian Way |
| Appii forum |
| Appius Claudius |
| apple |
| Applegarth, Robert |
| Applegate, Jesse |
| applejack |
| apple maggot |
| apple of discord |
| Appleseed, Johnny |
| Appleton, Daniel |
| Appleton, Sir Edward Victor |
| Appleton |
| apple worm |
| appliqué |
| Appomattox |
| Apponaug |
| apprenticeship |
| APRA |
| Apraksin, Feodor Matveyevich |
| apricot |
| Apries |
| April |
| April Fool’s Day |
| apse |
| Apsheron |
| apsides |
| apsis |
| apteryx |
| Apuleius, Lucius |
| Apulia |
| Apure |
| Apurímac |
| Aqaba |
| Aqaba, Gulf of |
| Aqmola |
| Aqtöbe |
| aquaculture |
| aqua fortis |
| aquamarine |
| aqua regia |
| aquarelle |
| Aquarids |
| aquarium |
| Aquarius |
| aquatint |
| Aquaviva, Claudio |
| aqueduct |
| Aquidneck |
| aquifer |
| Aquila, in the Bible |
| Aquila, in astronomy |
| Aquila Ponticus |
| Aquilegia |
| Aquileia |
| Aquinas, Saint Thomas |
| Aquino, Corazon |
| Aquitaine |
| Ar, in the Bible |
| Ar, chemical symbol |
| Ara |
| Arab |
| Arabah |
| arabesque |
| Arabia |
| Arabian art and architecture |
| Arabian Desert |
| Arabian Gulf |
| Arabian horse |
| Arabian music |
| Arabian Nights |
| Arabian Sea |
| Arabic languages |
| Arabic literature |
| Arab-Israeli Wars |
| Arabistan |
| Arab League |
| Arab Maghreb Union |
| Arabs |
| Aracaju |
| Arachne |
| arachnid |
| Arad, in the Bible |
| Arad, city, Romania |
| Aradus |
| Arafat, Yasir |
| Arafat |
| Arafura Sea |
| Aragats, Mount |
| Arago, Dominique François |
| Aragon, Louis |
| Aragón |
| Aragón, house of |
| Araguaía |
| Arah |
| arahant |
| Araish, Al |
| Arak |
| Arakan |
| Arakcheyev, Aleksey Andreyevich |
| Araks |
| Aral Kara Kum |
| Aral Sea |
| Aram |
| Aram, Eugene |
| Aramaic |
| Aramburu, Pedro Eugenio |
| Aram-naharaim |
| Aram-zobah |
| Aran |
| Arana Osorio, Carlos |
| Aranda, Pedro Pablo Abarca de Bolea, conde de |
| Aranguren, José Luis |
| Aran Islands |
| Aranjuez |
| Arany, János |
| Arao |
| Arapaho |
| arapaima |
| Ararat |
| Aras |
| Arason, Jon |
| Aratus, Greek poet |
| Aratus, Greek statesman and general |
| Araucanians |
| Araunah |
| Aravalli Hills |
| Arawak |
| Araxes |
| Arba |
| Arbela |
| Arber, Werner |
| arbitrage |
| arbitration, industrial |
| arbitration, international |
| Arblay, Madame d’ |
| Arboga |
| Arboleda, Julio |
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| | | The Columbia Encyclopedia, Sixth Edition. Copyright © 2007 Columbia University Press. |
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