Tập_tin:Langson1981.jpg
Tập_tin:Langson1981.jpg

Tập_tin:Langson1981.jpg

Battle of Hill 400, Langson 1981Theo Edward C. O'dowd (2007). 'Chinese Military Strategy in the Third Indochina War', trang 94, From "Indochina Atlas", 1970, by Directorate of Intelligence, U.S. Government. Courtesy of the University of Texas Libraries, The University of Texas at Austin www.lib.utexas.edu/maps/indochina_atlasFeb 18 2009RotcehXem bên dưới.