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accounted agricultural production Ai-fei Amur and Ussuri Amur River Amur-Ussuri region betula broad roads Chia-yin China proper Ching dynasty Ching government coal field commodities coniferous economic farm lands fishing forest areas freight traffic Fu-chin Fu-yuan gold mining haien hectare Hei-ho special district highway Hsiao-hsing-an-ling hsien Hsing-kai-hu Hu-lin Hu-ma Hu-tou Hun-ta-shan important increased industrial Japanese occupation period kaoliang large number larix dahurica Liberation Lo-pei located lower course Manchuria marine products Mi-shan middle course Mo-ho mountain areas Mu-ling-ho navigation Northeast China northern passenger traffic pinus pinus koraiensis plain Po-ching population population density populus davidiana porpoise quercus mongolica railroad rainfall region's total reign resettlement rice Russians San-chiang season soil type Soviet Union soybean special native products Sung-hua-chiang Ta-hsing-an-ling temperature tilia amurensis tillable lands tion tons total land area town tributaries Tung-chiang unit yield upper course Ussuri River vere volume of freight water flow water level water transportation wheat winter Yao-ho