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| | Heilongjiang |
 | | China's largest oilfield is located in the province, at Daqing, and coal is mined in the east of Heilongjiang; other industries are engineering, including the manufacture of machinery, tools, and building materials, food-processing, timber and wood products, and also ice-skates, of which the province is one of the world's leading producers. |
 | | Agriculture is based on wheat, maize, sugar beet, soya beans, dairy farming, and sheep rearing. |
 | | The borders of Heilongjiang were disputed by the Russians and the Chinese from the 17th to 19th centuries, when China ceded large territories to the province's north and east to Russia. |
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