Flags of the Nguyễn dynasty's administrative units explained

Flags of the Nguyễn dynasty's administrative units^[1] were used since about 1868 to 1885, with 1:1 ratio.

Sources

Peter Truhart, Regents of Nations, K.G Saur Münich, 1984–1988, Art. «Vietnamese Dynasties/Vietnamesische Dynastien», pp. 1786–1790.
The star icon in Vietnamese consciousness (TTXVA.NET).
Hervé Calvarin, Olivier Corre: L'Indochine. Étude d'Histoire vexillologique. In: Franciae Vexilla. (Bulletin de la Société Française de Vexillologie) Numéro spécial 2005, 20e anniversaire de la Société Française de Vexillologie-SFV,, S. 89-126; 147-162. (in French).