so,you can say Huangsha island is part of vietnam by this map. on the same as you say,this map could provid a evidence that vietnam is apart of China? Don't be forget that written in chinese.and the map mean“ china civil map”,that means vietnam is a part of china.
you are idiot. Japanese has been used Han Zi to writing until now aday. Does it mean Japan is part of China. When you are not false flagger, When Korean has used Han Zi to writing in the past ? does it mean Korean is part of China ?
The map I posted is about Quang Nam province of Vietnam in our old book.