Amber Room
Catherine Palace, Amber, Mirror, Eighth Wonder of the World, Prussia, Andreas Schlüter, Charlottenburg Palace, Frederick William I of Prussia, Peter I of Ru... »

Angkor Wat
Angkor, Cambodia, Suryavarman II, Khmer Empire, Architecture of Cambodia, Vedic meter, Khmer language »

Animaniacs
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Anthracite
Anthracite, Coal, Lustre (mineralogy), Carbon, Heat of combustion, Tar, Hydrocarbon, Combustion, Bituminous coal, Lignite, Pigment, Geology »

Antimatter
Antiparticle, Positron, Antihydrogen, Antiproton, Annihilation, Photon, Gamma Ray, Asymmetry, Unsolved Problems in Physics, Plasma Cosmology, Particle Accele... »

Appalachia
Apalachee, Appalachian Mountains, Appalachian Regional Commission, Social and Economic Stratification in Appalachia, List of Appalachian Regional Commission ... »

Apple Iigs
Apple II series, Microcomputer, Apple Inc., Macintosh, Timeline of Apple II family, List of Apple IIGS games »

Aqua Regia
Aqua regia, Nitric acid, Hydrochloric acid, Noble metals, Gold, Platinum, Tantalum, Iridium, Osmium, Titanium »

Archbishop
Christianity, Bishop, Diocese, Holy Orders, Catholic Church, Anglican Communion, Primate (religion), Diocesan bishop, Metropolitan bishop, Suffragan bishop, ... »

Arya Samaj
Hindu reform movements, Swami Dayananda Saraswati, Sannyasa, Infallibility, Moral absolutism, Vedas, Karma, Reincarnation, Brahmacharya, Principles of Arya S... »