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Air Pollution

Air pollutants are substances that, when present in the atmosphere in sufficient quantities, may adversely affect people, animals, vegetation or inanimate materials.

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Air Profile Recorder

Air Profile Recorder (APR), a narrow-beam recording radar altimeter designed to provide topographic profiles for use in the mapping of wilderness areas. The instrument employs a 3.2 cm pulse transmitter that feeds a parabolic radiator, mounted below the aircraft.

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Airport

For statistical and administrative purposes, the federal government has divided the Canadian airport system into 5 major classes of airports: international, national, regional, local commercial and local.

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Airport Architecture

A new wave of construction was inspired by the formation of the Department of Transport in 1937 and the inauguration of Trans-Canada Airlines (now Air Canada) in 1937. Dorval Airport (1940-41) near Montréal represented the new breed of airports.

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Alabama

Alabama, Confederate warship constructed in Britain during the American Civil War. The US sought to have the ship detained in Britain, but it escaped. Until it was sunk in June 1864, it attacked Union (Northern) shipping, inflicting great losses.

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Alberta Ballet Company

The Alberta Ballet Company was founded in Edmonton in 1958 by Ruth Carse as an amateur troupe under the name of Dance Interlude. It was incorporated in 1961 as the Edmonton Ballet Company and reconstituted in 1966 as a professional dance ensemble under its present name. Carse retired in 1975.

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Alberta Choral Federation

Alberta Choral Federation (Alberta Choral Directors' Association 1972-81). Incorporated in 1972, the organization assumed its current name and extended the scope of its activities and services to choral singers and choirs, as well as directors, in 1981.