US Army - FM 21-31 - Topographic Symbols.pdf

22. Control Points and Elevations in some cases, may be less than third order
a. Application of Definitions. The definitions
of horizontal and vertical control stations which
follow are generally applicable only to the
United States.
b. Exceptions. In foreign areas, horizontal
control stations may not be monmented and
accuracy. Whenever information is available.
exceptions are noted in the marginal legend
of the map.
c. Symbols. The following pages contain the
approved symbols for control points and eleva-
tions.
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