Thailand 1:50,000 /
United States.Army Map Service.
[Washington, D.C. : Army Map Service, Corps of Engineers, U.S. Army],
1957-
Issued in quadrangles 10 minutes of latitude and 15 minutes of longitude.
"Contour interval 20 meters with supplementary contours at 10 meter intervals."
English and Thai.
Each sheet includes "Glossary," "Index to boundaries" and "Index to adjoining sheets."
Some sheets include "Coverage diagram."
Each sheet has name of quadrangle at top, and at lower right.
"Edition 1-AMS" or "Edition 1-AMS (FE)."
Various editions of some sheets.
Graphic index in central GSGS file.
Transverse Mercator projection (Cartography)