
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.