- A
- Aachen
- Aalborg
- Aar
- Aarau
- Aard-vark
- Aard-wolf
- Aargau, or Argovia
- Aarhuus (district)
- Aarhuus (city)
- Aaron
- Ab
- Ababdeh, Ababde, or Ababidek
- Abaco, Great and Little
- Abacus
- Abakansk
- Abancay
- Abano Bagni
- Abarim
- Abattoir
- Abbas Pasha Hilmi
- Abbassides
- Abbazia
- Abbé
- Abbe, Cleveland
- Abbeville (South Carolina)
- Abbeville (France)
- Abbey
- Abbey, Edwin Austin
- Abbey, Henry Eugene
- Abbot
- Abbotsford
- Abbott, Alexander Crever
- Abbott, Benjamin Vaughan
- Abbott, Charles Greeley
- Abbott, Emma
- Abbott, Jacob
- Abbott, Lyman
- Abbreviations
- Abdallah, Ben-Abd-el-Mottalib
- Abdal-Malek, or Abdulmelech
- Abd-el-Kader
- Abd-er-Rahman I.
- Abd-er-Rahman III.
- Abdication
- Abdomen
- Abdominals
- Abduction
- Abductor
- Abd-ul-Aziz
- Abdul-Hamid II.
- Abdul-Medjid
- Abdurrahman Khan
- À Becket, Thomas
- Abel
- Abélard, Pierre
- Abencerrages
- Abercrombie, John
- Abercrombie, Sir Ralph
- Aberdeen (Scotland)
- Aberdeen (South Dakota)
- Aberdeen (Washington)
- Aberdeen, George Hamilton Gordon, Earl of
- Aberdeen, University of
- Abernethy
- Abernethy, James
- Abernethy, John
- Aberration
- Abesta, or Avesta
- Abhedananda, Swami
- Abijah
- Abila, or Abyla
- Abilene
- Abington
- Abkhasia
- Abnoba, now Abenau
- Åbo
- Åbo, Archipelago of
- Åbo, Peace of
- Abolitionists
- Aboma
- Abomey
- Aborigines
- Abortion
- Aboukir
- Aboulfeda, or Abulfeda
- About, Edmond
- Abracadabra
- Abraham
- Abraham, Plains of and Heights of
- Abrasives
- Abruzzi, Prince Luigi Amadeo of Savoy-Aosta, Duke of
- Abruzzi and Molise
- Absalom
- Abscess
- Absolute
- Absolution
- Absorption
- Abstinence
- Abstract of Title
- Abstraction
- Abt, Franz
- Abu
- Abu-Bekr
- Abu-Simbel
- Abydos
- Abyssinia
- Abyssinian Church
- Acacia
- Academics
- Academy
- ...
- Acetylene
- Acetylene gas
- Acetylene lamp
- ...
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- Adams
- Adams, Brooks
- Adams, Charles Follen
- Adams, Charles Francis
- Adams, Charles Francis (son)
- Adams, Charles Kendall
- Adams, Franklin Pierce
- Adams, George Burton
- Adams, Henry
- Adams, Henry Carter
- Adams, Herbert
- Adams, John
- Adams, John Quincy
- Adams, Maude Kiskadden
- Adams, Samuel
- Adams, Samuel Hopkins
- Adams, William Taylor
- Adamson Law
- Addams, Jane
- Adder
- Adding Machines
- ...
- Aeronautics
- Aeschylus
- ...
- Afghanistan
- Africa
- Agaña
- ...
- Agricultural chemistry
- Agricultural education
- Agricultural machinery
- Agriculture
- Agriculture, Department of
- Agrigentum
- Agrippa II., Herod
- Aguas Calientes
- Ague
- Aguilar, Grace
- Aguinaldo, Emilio
- Agulhas, Cape
- Ahab
- Ahasuerus
- Ahmadabad
- Ahmed Mirza
- Ahriman
- Ai
- Aid-de-Camp, Aide-de-Camp
- Aïdé, Hamilton
- Aiken
- Ailanthus, or Ailantus
- Ainsworth, Frederick Crayton
- Ainsworth, William Harrison
- Aintab
- Air
- ...
- Akyab
- Alabama (State)
- Alabama (river)
- Alabama City
- Alabama Claims
- Alabama Polytechnic Institute
- Alabama, The
- Alabama, University of
- Alabaster
- Alagoas
- Alajuela
- Alamanni, Luigi
- Alameda
- Alamo, The
- Alarcón, Hernando
- Alarcón y Mendoza, Don Juan Ruiz de
- Alaria
- Alaric
- Alaric II.
- Alaska
- Alba Longa
- Alban, St.
- Albani
- Albani, Francesco
- Albani, Marie Emma (Lajeunesse)
- Albania
- Albano
- Alban's, St.
- Albany (Alabama)
- Albany (Georgia)
- Albany (New York)
- Albany Congress
- Albany Regency, The
- Albatross
- ...
- Albion (Michigan)
- Albion (New York)
- Albion College
- Alboin
- Albolene
- Albright College
- Albuera
- Albumen
- Albuminoids
- Albuquerque
- ...
- Alcott, Amos Bronson
- Alcott, Louisa May
- ...
- Alessandria
- Aleutian Islands
- Alewife
- Alexander (ancient)
- ...
- Algiers
- ...
- Almanac
- ...
- Alps
- Alsace-Lorraine
- Alsberg, Carl Lucas
- ...
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- Americanization
- American Legion
- American Party, The
- American Protective Association
- ...
- Andes
- ...
- Andreyev, Leonid
- ...
- Annapolis
- Ann Arbor
- ...
- Apple
- Appleton
- Appogiatura
- Appold, John George
- Appomattox Court House
- Apponyi, Albert, Count
- Apportionment Bill
- Apprenticeship
- Apricot
- April
- Apron
- Apse
- Apsides
- ...
- Aristophanes
- Aristotle
- Aristotelianism
- Aristoxenus
- Arithmetic
- Arithmetical Complement
- Arithmetical Mean
- Arithmetical Progression
- Arithmetical Proportion
- Ari Thorgilsson
- Arius
- Arizona
- Arizona, University of
- Arjish Dagh
- Ark
- Arkansas
- Arkansas City
- Arkansas River
- Arkansas, University of
- ...
- Armstrong, William George, Lord
- Army
- Army Corps
- Army Schools
- Army War College
- ...
- Arthritis
- Arthropoda
- Arthur
- Arthur, Chester Alan
- Arthur, Julia
- Artichoke
- Article
- ...
- Asama
- Asaph
- Asarabacca
- Asbestos
- Asbury, Francis
- ...
- Astor, John Jacob (merchant)
- Astor, John Jacob (capitalist)
- Astor, Lady Nancy
- Astor, William Backhouse
- Astor, William Waldorf
- Astor Place Riot
- Astoria
- Astræidæ
- Astragal
- ...
- Atkinson, Edward
- Atkinson, Eleanor
- Atlanta
- ...
- Augusta (Georgia)
- Augusta (Maine)
- ...
- Aurochs
- Aurora
- Aurora Borealis
- Aurungzebe
- Ausable Chasm
- Auscultation
- Auspices
- Austen, Jane
- Austerlitz
- Austin (Minnesota)
- Austin (Texas)
- ...
- Azerbaijan, Republic of
- Azimuth
- ...
- Azure
- Azurine
- Azurite
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- B
- Baal
- ...
- Ball's Bluff
- Balmaceda, José Manuel
- Balmoral Castle
- Balsam (impatiens)
- Balsam (substance)
- Baltic Provinces
- Baltic Sea
- Baltimore
- Baltimore, George Calvert, Lord
- Baltimore Bird
- Baluchistan
- ...
- Bangor (Pennsylvania)
- Bangor (Wales)
- Bangor Theological Seminary
- Bangs, John Kendrick
- Bank
- Bankhead, John Hollis
- Bank Note
- Bankruptcy Laws
- Banks, Federal Reserve
- Banks, Louis Albert
- Banks, Nathaniel Prentiss
- Banks, Thomas
- Banks in the United States
- Banks Land
- Bann
- Bannockburn
- Banquette
- ...
- Bathurst Island
- Baton Rouge
- ...
- Beaver
- Beaver Dam (Wisconsin)
- Beaver Dam
- Beaver Falls
- Bebel, Ferdinand August
- Bechuanaland
- Beck, James Montgomery
- Becker, George Ferdinand
- Becket, Thomas à
- Bede
- Bedford (borough)
- Bedford (city)
- Bedford, John Plantagenet, Duke of
- Bedford Level
- Bedfordshire
- Bedlam
- Bedloe's Island
- Bedouins
- Bee
- Beebe, (Charles) William
- Beech
- Beecher, Edward
- Beecher, Henry Ward
- Beecher, Lyman
- Beef
- Beer
- Beerbohm, Max
- Beers, Henry Augustin
- Beersheba
- Berger, Victor L.
- ...
- Bernard, St.
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