This field contains mathematical data associated with cartographic material, including
a statement of scale, statement of projection and/or a statement of bounding coordinates.
The coordinates can represent a bounding rectangle, the outline of the area covered, and/or
the outline of an interior area not covered. For celestial charts, it may also contain a statement
of zone, declination data, and/or right ascension data and/or equinox.
Examples:
245 10 $a Tourist Map of Sydney
$h [cartographic material]
255 $a Scale 1:100,000
245 11 $a [Atlantic Ocean floor]
$h [cartographic material]
255 $a Scale 1:31,860,000 ;
$b Mercator proj.
245 10 $a Indian Ocean :
$b azimuthal equidistant projection
center[ed at 13 degrees 00 minutes S,
76 degrees 00 minutes E]
$h [cartographic material]
255 $a Scale [ca. 1:70,000,000] ;
$b azimuthal equidistant proj.
245 10 $a Geological map of the Maltese Islands
$h [cartographic material]
255 $a Scale 1: 25,000
$c (E 14000'-E 14035'/N 36005'-N 35048')
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