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  • A ... A. H. Robins Company
  • A. M. Turing Award ... Aaron ben Elijah
  • Aaron ben Meir ... Abāy River
  • abaya ... Abbott, Tony
  • Abbott, William Alexander ... ʿAbd Allāh ibn Yasīn
  • ʿAbd Allāh ibn ʿAbd al-ʿAzīz ... Abdullah, Omar
  • Abdullah, Sheikh Muhammad ... Aberewa
  • Aberfan ... Abitibi Belt
  • Abitibi River ... About Last Night…
  • About Mrs. Leslie ... Abron
  • Abron language ... abstinence
  • abstinence syndrome ... Abū Bakr Muḥammad ibn Yaḥyā ibn al-Sāyigh al-Tujībī al-Andalusī al-Saraqustī
  • Abū Bakr Muḥammad ibn ʿAbd al-Malik ibn Muḥammad ibn Muḥammad ibn Ṭufayl al-Qaysī ... Abū Ṭālib Kalīm
  • Abū Tamīm Maʿad ... Abutilon
  • abutilon ... academy ratio
  • Academy, Gallery of the ... Accelerate
  • accelerated cost recovery system ... Account of a New Anaesthetic Agent
  • Account of a Visit from St. Nicholas ... Acerentomata
  • Acerentomidae ... Acheron
  • Acheron ... Acidithiobacillus ferrooxidans
  • acidity ... Aconzio, Giacomo
  • Acorales ... acro
  • Acrobat ... Acte sans paroles, I
  • Acteal ... active chess
  • active crowd ... acute otitis media
  • acute pain ... Adair, William
  • Adak ... Adams, Charles Kendall
  • Adams, Diana ... Adar Doutchi
  • Adar Sheni ... adductor pollicis muscle
  • Ade, George ... Ader Avion III
  • Ader Éole ... adit
  • Aditi ... admiral
  • Admiral Broadway Revue, The ... adoption
  • adoption ... Adroqué, Esteban
  • AdS/CFT correspondence ... adventure game, electronic
  • Adventure of Iron Pussy, The ... Adzhariya
  • Adzhubei, Alexei ... Aelle
  • Aelle of Northumbria ... aerofoil
  • aerogel ... Aethelred of Rievaulx, Saint
  • Aethelred Unraed ... affix
  • affixation ... Africa’s struggle against AIDS
  • Africa, Horn of ... African Party for the Independence of Guinea-Bissau and Cape Verde
  • African penguin ... Afro-Cuban
  • Afro-Cuban dance ... Āgahī, Muhammad
  • Agaie ... Agathis australis
  • Agatho, Saint ... agency theory, financial
  • Agenda 21 ... Agis II
  • Agis III ... Agony in the Garden
  • Agony in the Garden, The ... agricultural prices
  • Agricultural Research Service ... Aguilar, Toni
  • Aguilar, Tony ... Ahikar
  • Ahikar, The Story of ... Ahmed, Abdullah Yusuf
  • Ahmed, Abdullahi Yusuf ... Aidan
  • Aidan, Saint ... Ain, Al-
  • Āīn-e Akbarī ... air space
  • air spring ... Airpower Museum
  • airship ... Ajax the Greater
  • Ajax the Lesser ... Akatsuki
  • Akatsuki no tera ... Akimetes, Saint Alexander
  • Akimiski ... Akuffo, Frederick W. K.
  • Akufo-Addo, Nana Addo Dankwa ... Alabama, University of
  • alabaster ... alap
  • alapa ... ʿAlāʾ ad-Dīn Kay-Qubādh I
  • ʿAlāʾ ad-Dīn Kay-Qubādh II ... Albee, Edward Franklin
  • Albee, Edward Franklin ... Albert-Louppe Bridge
  • Albert-Ludwigs-Universität Freiburg im Breisgau ... Albrecht Dürer
  • Albrecht VII ... Alcázar
  • alcázar ... Alcorn, Al
  • Alcorta, José Figueroa ... Alecsandri, Vasile
  • Alectis crinitis ... Aleppo, Great Mosque of
  • alerce ... Alexander Supertramp
  • Alexander the Great ... Alexandroúpoli
  • Alexandroúpolis ... Alfonso the Just
  • Alfonso the Kind ... Algerus Magister
  • Algezira Sucro ... Ali, Ahmed
  • Ali, Choudhry Rahmat ... Alipore
  • Alipur ... alkoxy radical
  • alkoxy-silane ... All the Pretty Horses
  • All the Talents, Ministry of ... Allee, Warder Clyde
  • Allegany ... Allen, John
  • Allen, John K. ... alliance theory
  • Alliance, Treaty of ... allopreening
  • allopurinol ... Almelo
  • almemar ... Alonso, Mateo
  • Alonso, Severo Fernández ... alpha oscillation
  • alpha particle ... Alpine ski
  • Alpine skiing ... Altay
  • Altay ... Altman, Klaus
  • Altman, Robert ... Alumni Hall
  • Alun ... Ama-ga
  • Amabutho ... Amanita phalloides
  • Amanita verna ... Amathus
  • Amati family ... Ambazac Mountains
  • Ambedkar, Bhimrao Ramji ... Ambrosia
  • Ambrosia artemisiifolia ... Amenophis I
  • Amenophis II ... American Bandstand
  • American Bandstand ... American Dental Hygienists’ Association
  • American Derby ... American horseshoe crab
  • American Horticultural Society ... American National Red Cross
  • American National Standards Institute ... American School of Archaeology
  • American School of Classical Studies ... American Wood Paper Company
  • American woodcock ... Amherst of Arracan, William Pitt Amherst, 1st Earl, Viscount Holmesdale, Baron Amherst of Montreal
  • Amherst, Jeffery Amherst, 1st Baron ... Amis du Manifest et de la Liberté
  • Amis language ... Ammospermophilus
  • Ammospermophilus leucurus ... amortization
  • Amorum Emblamata, Figuris Aeneis Incisa ... amphitheater
  • amphitheatre ... Amsterdam Historical Museum
  • Amsterdam News ... Amytal
  • An ... anaerobic respiration
  • anaesthesia ... analytic philosophy
  • analytic proposition ... Anarawd
  • anarcha-feminism ... Anatolian plateau
  • Anatolian religion ... Ancient Chinese language
  • Ancient Church of the East ... Andalusia Technology Park
  • Andalusian Dog, An ... Anderson, Margaret Caroline
  • Anderson, Marian ... Andorra, flag of
  • Andorra, University of ... Andrews, Dana
  • Andrews, Fannie Fern Phillips ... Andropov, Yury
  • Andropov, Yury Vladimirovich ... Angaran Shield
  • angaria ... Angelus Temple
  • Angelus, Isaac ... Anglican Communion
  • Anglican Consultative Council ... Angora
  • Angora goat ... Anhinga novaehollandiae
  • Anhinga rufa ... animal virus
  • Animal Welfare Act ... ankyloglossia
  • ankylosaur ... annatto
  • Annaud, Jean-Jacques ... annual wild rice
  • Annual, Battle of ... Anopheles gambiae
  • Anopheles maculipennis ... Anselm of Saint Mary
  • Anselm of the Virgin Mary, Father ... Antalya Plain
  • Antampatrana ... anterograde degeneration
  • anteroposterior axis ... Anthracite Belt
  • anthracnose ... Anti-Submarine Detection Investigation Committee device
  • Anti-Suffragist, The ... antifriction bearing
  • antifungal drug ... antinuclear movement
  • antinucleon ... antiserum
  • antiship missile ... Antonio, Nicolás
  • António, prior do Crato ... Anvers
  • Anvers ... aorta
  • aorta, coarctation of the ... Apatornis
  • Apatosaurus ... Aphrodite Genetrix
  • Aphrodite of Cnidus ... Apocephalus borealis
  • Apocolocyntosis divi Claudii ... Apollonius of Tralles
  • Apollonius of Tyana ... Apotgan
  • apothecaries’ scruple ... Appendix to Sigebert
  • Appendix Vergiliana ... applied science
  • Applied Semantics ... Aptheker, Herbert
  • Apthorp, Sarah Wentworth ... Aquatic industry
  • aquatic leech ... Arab revolt
  • Arab Revolt ... Arachne
  • Arachne machine ... Aramis
  • Aramus guarauna ... Arbaʿa ṭurim
  • Arbe ... Arcand, Denys
  • Arcandor ... Archelaus
  • Archelaus Sisines ... architecture, Syro-Palestinian
  • architecture, Western ... Arcturus the Hunting Hound and Other Stories
  • arcuate artery ... area postrema
  • area rule ... Arewelahayerên
  • Arewmtahayerên ... Argishti II
  • Argo ... Ariadne and Bluebeard
  • Ariadne auf Naxos ... Arisaema
  • Arisaema dracontium ... Arizona Coyotes
  • Arizona Diamondbacks ... ARM
  • arm ... Armenian Catholic Church
  • Armenian chant ... Armstrong Flight Research Center
  • Armstrong Hot Five ... Arnim, Elisabeth Katharina Ludovica Magdalena von
  • Arnim, Hans Georg von ... aron ha-Berit
  • aron ha-qodesh ... Arreola, Juan José
  • Arrernte ... Arsaces
  • Arsaces I ... Art Ensemble of Chicago
  • art fairy tale ... Artashes
  • Artatama I ... arthritis
  • arthritis mutilans ... artificial life game, electronic
  • artificial lift ... Artusi, Giovanni Maria
  • Artvin ... aryl salt
  • arylamine ... āsana
  • asana ... ASCI
  • ASCI Blue Gene/L ... Ash, Sholem
  • ash, volcanic ... Ashkenazi, Vladimir Davidovich
  • Ashkenazic script ... Ashʿarīyah
  • Ashʿariyyah ... ʿAsīr
  • Asir ... aspect
  • aspect ratio ... Assam Himalayas
  • Assam macaque ... Assiniboia
  • Assiniboin ... Assyria
  • Assyrian ... Astor of Hever Castle, Waldorf Astor, 2nd Viscount
  • Astor of Hever, of Hever Castle, John Jacob Astor, 1st Baron ... Astronomisches Jahrbuch
  • astronomy ... At the End of the Open Road
  • At the Foot of Mount Sinai ... ATC
  • ATC ... Athenaeum
  • Athenaeus ... Atkan Aleut language
  • Atkins v. Virginia ... Atlantic saury
  • Atlantic Seaboard ... atol
  • atole ... ATP
  • ATP ... attainder, bill of
  • Attaingnant, Pierre ... attorney, power of
  • Attorney-General’s Department ... Aucassin and Nicolette
  • Aucassin et Nicolette ... Auersperg, Anton Alexander, Count von
  • Auersperg, Johann Weikhart, Prince von ... Augustan Age
  • Augustan History ... Aunt Dan and Lemon
  • Aunt Fanny ... aurresku
  • Aurro, Rosemarie Timotea ... Australia and New Zealand Closer Economic Relations Trade Agreement
  • Australia antigen ... Australian Plate
  • Australian Presbyterian Church ... autarkeia
  • autarky ... autogyro
  • autoharp ... autophagocytosis
  • autophagy ... avalanche diode
  • avalanche effect ... Aventine
  • Aventine secession ... avicularia
  • Avicularidae ... Avvakum Petrovich
  • avventura d’un povero cristiano, L’  ... Axgil, Axel
  • Axholme, Isle of ... Ayacucho Basin
  • Ayacucho, Battle of ... Ayraut, Pierre
  • ayre ... Ažbe, Anton
  • Azcapotzalco ... AZT
  • Aztec ... aʿyān
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