1929
Royal Survey Department
1:1m
1827
Vandermaelen, Philippe, 1795-1869
1:2m
1950
North-Vietnamese Geography Department
1:100k
1889
Pelet, Paul, 1849-1927
1:2m
1864
MOUHOT, Alexandre Henri.
1944
Army Information Branch, Army Service Forces
1965
The Associated Press
1944
United States. Army Service Forces. Army Information Branch.
1945
Great Britain. Inter-service Topographical Dept.
1897
SOMMERVILLE, Maxwell.