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circular shafts

См. также в других словарях:

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  • tunnels and underground excavations — ▪ engineering Introduction        Great tunnels of the world Great tunnels of the worldhorizontal underground passageway produced by excavation or occasionally by nature s action in dissolving a soluble rock, such as limestone. A vertical opening …   Universalium

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  • Ecclesiastical Architecture — • All ecclesiastical architecture may be said to have been evolved from two distinct germ cells, the oblong and the circular chamber Catholic Encyclopedia. Kevin Knight. 2006. Ecclesiastical Architecture     Ecclesiastic …   Catholic encyclopedia

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