Charts. Yangtze River. Yangtze River estuary, South Channel from sea to Middle Ground, from surveys by Hydrographic Department of Chinese Navy, with additions from survey by U. S. S. John Blish (AGS-10) and other sources to 1945; field chart no. 54. Scale naut. m.=0.8 in., natural scale 1:90,000. n. p., 1st edition, Nov. 1945, reprinted Mar. 1946.