[1938, Stanley F. Wright, “From the Revision that Failed to the Peking Tariff Conference of 1925-1926”, in China's Struggle for Tariff Autonomy: 1843-1938[1], Paragon Book Gallery, →OCLC, page 406:
The influx into the Chientao (間島) of Corean farmers, hunters, and trappers had long been a burning question before the Governments of China and Japan finally agreed by the Chientao Convention of 1909 or China-Corean Frontier Agreement to recognize the Tumen river as the boundary between Corea and China, and to open Lungchingtsun (龍井村) along with three other places to foreign residence and trade. A Chinese Custom House was accordingly opened here on 1st January 1910, but was made subordinate to the Hunchun (琿春) Customs.² It remained in this subordinate position till July 1924 when the head office was transferred to Lungchingtsun,³ while Hunchun—at which in accordance with the Manchurian Convention of 1905 a Custom House had been opened on 27th December 1909—fell into the position of a branch office. The reason for this deposition of Hunchun was the advent in 1923 of the T’ien T’u (天圖) light railway which running through Lungchingtsun to Yen Chi Fu (延吉府) connected both places with the frontier district of Kaishantun, and thence through Kainei (Hui Ning 會甯) to the Corean port of Seishin.]
[1969, Bong Baik, “For Final Victory”, in Kim Il Sung Biography: From Birth to Triumphant Return to Homeland[2], volume I, Tokyo: Miraisha, →OCLC, page 509:
Prostrate on the ground, they gazed at the stars shining in the dark sky and the lights shimmering in the direction of the city of Lungching.]
1995, Zhen-hua Liu, “Recent Neolithic Discoveries in Jilin Province”, in The Archaeology of Northeast China: Beyond the Great Wall[3], →ISBN, →LCCN, →OCLC, page 95:
Longjing county is another part of eastern Jilin province. It is located on the left bank of the middle reaches of the Tumen river. The Longgang range — a branch of the Changbai range — extends into the southern part of its territory.
The meeting was attended by approximately 30 people involved in youth work, including YCL committee members and heads of children’s departments in the Wangqing area, delegates of young people from Yanji, and student delegates (underground workers) from Longjing.
2014 May 27, “China, DPRK border cities open one-day bus tour”, in China Daily[5], archived from the original on 2022-08-14, Society[6]:
A one-day bus tour from the northeast China border city of Longjing to Hoeryong in the Democratic People's Republic of Korea (DPRK) was launched on Tuesday. The opening of the route will enable Chinese tourists to arrive in Hoeryong directly, without transferring to a DPRK vehicle at the port, according to Wang Jing, a government worker from Longjing in Jilin Province.
2018 December 19, “China to lift African swine fever limits for city in Jilin province”, in Louise Heavens, editor, Reuters[7], archived from the original on 12 May 2022, Consumer Products & Retail News[8]:
* Chinese officials will lift African swine fever-related restrictions in Longjing city, in northeastern Jilin province, the Ministry of Agriculture said on Wednesday
