Tonga : 40 /
Great Britain.Directorate of Colonial Surveys.
Great Britain.War Office.General Staff.Geographical Section.
[London] : Directorate of Colonial Surveys,
1956.
Relief shown by hachures.
"10,000/2/56 S.P.C.,R.E."
"Photographed by D.C.S. and printed by G.S.G.S."