irrigational system maintaining

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river — river1 riverless, adj. riverlike, adj. /riv euhr/, n. 1. a natural stream of water of fairly large size flowing in a definite course or channel or series of diverging and converging channels. 2. a similar stream of something other than water: a… … Universalium
Arabia, history of — Introduction history of the region from prehistoric times to the present. Some time after the rise of Islam in the first quarter of the 7th century AD and the emergence of the Arabian (Arab) Muslims as the founders of one of the great … Universalium

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