The New Encyclopædia Britannica: The new Encyclopædia BritannicaEncyclopædia Britannica, 1992 |
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Page 73
... irrigation became necessary . In the late Ch'un - ch'iu period and in the Chan - kuo period , irrigation works were con- structed in many states . These projects were built to drain swampy areas , to leach out alkaline soil and replace ...
... irrigation became necessary . In the late Ch'un - ch'iu period and in the Chan - kuo period , irrigation works were con- structed in many states . These projects were built to drain swampy areas , to leach out alkaline soil and replace ...
Page 201
... irrigation system Principal highways The canyon and plateau regions. highlands of western Szechwan , and both have become endangered because of overcutting of their diet . Settlement patterns . As one of the most densely pop- ulated ...
... irrigation system Principal highways The canyon and plateau regions. highlands of western Szechwan , and both have become endangered because of overcutting of their diet . Settlement patterns . As one of the most densely pop- ulated ...
Page 216
... irrigation . Many canals have been built over the centuries . The network of willow - lined canals and paddy fields gives the landscape a look resembling that of southern China . The climate of Ningsia is continental . Temperatures ...
... irrigation . Many canals have been built over the centuries . The network of willow - lined canals and paddy fields gives the landscape a look resembling that of southern China . The climate of Ningsia is continental . Temperatures ...
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