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- alabama claims
- alabaster
- alaca hüyük
- aladdin
- alamo
- åland islands
- alanine
- alaska
- alaska highway
- alaska purchase
- alaska range
- alaska, gulf of
- alaskan malamute
- alaungpaya dynasty
- albacore
- albanian language
- albany congress
- albatross
- albedo
- albemarle sound
- alberta, university of
- albigensian crusade
- albinism
- albite
- albumin
- alcatraz island
- alcazar
- alcestis
- alchemy
- alcmaeon
- alcmaeonid family
- alcoa
- alcohol
- alcoholic beverage
- alcoholics anonymous (aa)
- alcoholism
- aldehyde
- alder
- ale
- aleatory music
- alemán, mateo
- alentejo
- alenu
- aleph
- aleut
- aleutian islands
- alewife
- alexander archipelago
- alexander island
- alexandria, library of
- alexandria, museum of
- alexandrine
- alexandrists
- alfalfa
- algae
- algebra
- algebraic equation
- algebraic geometry
- algebraic topology
- algeciras conference
- algerian reformist 'ulama', association of
- algerian war
- algol
- algonquian languages
- algorithm
- algorithms, analysis of
- alhambra
- alice springs
- alien
- alien and sedition acts
- alienation
- alimentary canal
- alitalia
- aliyah
- alkali
- alkali feldspar
- alkali metal
- alkaline earth metal
- alkaloid
- alkane
- all saints' day
- all souls' day
- allah
- alleghenian orogeny
- allegheny mountains
- allegheny river
- allegory
- allele
- allemande
- allergy
- alliance
- alliance for progress
- alliance israélite universelle
- allied powers
- alligator
- alliteration
- allium
- allocation of resources
- allosaurus
- allosteric control