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Inset: Hankow River Gauge-average levels
Mainly from a survey by the Chinese Maritime Customs in 1919 with additions from other sources
Relief shown by form lines and spot heights; depths shown by soundings and isolines
Polygon: 30.67083333,114.2472222 30.67083333,114.3666667 30.52222222,114.3666667 30.52222222,114.2472222 30.67083333,114.2472222
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Special Collections & Archives, UC San Diego, La Jolla, 92093-0175 (https://lib.ucsd.edu/sca)
2nd edition, No. 2526
Public Domain (US)
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