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- Anthony, John Gould
- Anthony of Padua, Saint
- Anthony, Sister
- Anthony, Susan Brownell
- Anthony, William Arnold
- Anthony
- Anthosiderite
- Anzengruber, Ludwig
- Apostle
- Appalachian America
- Appalachian Mountain Club
- Appalachian Mountains
- Appalachicola River
- Appam Case, The
- Appleton, Daniel
- Apteryx
- Apthorp, William Foster
- Apukhtin, Aleksei Nikolayevitch
- Aquarium
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- Arbitration, Industrial
- Arbitration, International
- Arboga
- Arboleda, Julio
- Arbor Day
- Arbor Vitæ
- Arboretum
- Arboriculture
- Arents, Albert
- Army ration
- Arndt, Ernst Moritz
- Arndt, Johann
- Arndt, Wilhelm
- Arndts von Arnesberg, Ludwig
- Arrow-Maker, The
- Arrow-Root
- Arthropoda
- Arthrostraca
- Arthur (king)
- Arthur, Prince
- Arthur (duke)
- Arthur, Chester Alan
- Astor, John Jacob (merchant)
- Astor, John Jacob (capitalist)
- Astor, John Jacob (inventor)
- Astor, William Backhouse
- Astor, William Waldorf
- Astor Family
- Astor Library
- Astor Place Riot
- Astorga, Emanuele d'
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- Audubon, John James Fougère
- Audubon Societies
- Aue, Hartmann von
- Aue
- Auenbrugger von Auenbrug, Leopold
- Auer, Alois
- Auer, Leopold
- Auerbach, Berthold
- Auerbach, Henry
- Auerlite
- Auersperg, Adolf Wilhelm Daniel
- Auersperg, Anton Alexander, Count of
- Auerstadt
- Auf der Höhe
- Auffenberg, Joseph, Baron von
- Aufrecht, Theodor
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