Tan Trao - the Area of Revolutionary Historical Relics – it is located in the land between the two districts of Son Duong & Son Quan of Tuyen Quang Province. Tan Trao was called the Capital of the Liberation Area in the North of Vietnam. The book provided a readership and some certain researchers with map, overview & general presentation, geographical descriptions & distributions and other rare materials in details of famous places such as: cottages of La Nua, Hang Bong, village communal halls of Hong Thai & Tan Trao, Safety Area of Kim Quan... Tan Trao is an important area that closely connected with activities, functions & performance of President Ho Chi Minh, Vietnam Communist Party central committee and the Government's agencies & bodies ( in total of 70 ) from the year of 1942 to 1954.