In Gansu and Qinghai Provinces and throughout north-central China, people of nine different ethnic groups share a music tradition known as Hua er.
Raedemaeker was initially held in Gansu but was later allowed to live with his partner in a Beijing hotel because of his poor health, media reports say.
BBC: Belgian art dealer convicted of smuggling in China dies
The story begins in 1992, when an army unit from Lanzhou in neighbouring Gansu province, drilling with state permission, made a decent oil find in Jingbian county.
ECONOMIST: In rural China, a private oil boom became a state-owned one
In Ningxia, Gansu and Inner Mongolia, for example, they are drawing far more than their fair share of the Yellow River's water.
Lanzhou in north-west Gansu ranked last, while Haikou on southern Hainan island was rated with the cleanest air.
Dubs says the Chinese kept the ex-legionaries as frontier guards, installing them in a specially created town called Liqian in what is now Gansu.
In 2008, he was convicted by a court in the western province of Gansu, where the sarcophagus was from.
BBC: Belgian art dealer convicted of smuggling in China dies
Eager to escape Beijing, he volunteered for a post at the Liujiaxia Hydraulic Power Plant in the northwestern province of Gansu.
Guan Yiquan, a Chinese scholar in Lanzhou, the capital of Gansu, also became convinced that Liqian had links to Rome.
Wind power is also being experimented with in a small way for power generation in northern and western China, where it could supply electricity to rural villages in windswept and increasingly arid Inner Mongolia and Gansu Province that are still not on the grid.
In the north Ningxia, Shanxi, Hebei and Gansu are drought-stricken.
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