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open(IN, '<', $file) or die "Couldn't open $file for reading: $!\n\n";

...
        $stn{$s} = [ $x, $y, $z ];
                   ## HoA:  Keys   =  Stn ID
                   ##       Value  =  Stn Coords

$seg{$lname} = { 'header'   => \@hdr,
                 'stations' => \%stn, };

__DATA__
 80-101               412 54175659N114551423W 635314260187896 6756
...
H PROSPECT    : *************
H CONTRACTOR  : CANJAY EXPLORATION          LINE NAME      : 80-103
H SURVEY CO.  : CANJAY EXP.                 UNIQUE ID      : *******

__DATA__
 80-101               412 54175659N114551423W 635314260187896 6756
...
 80-103               226 54160602N114433931W 647983760157606 6763
 80-103               227 54160602N114434302W 647916760157585 6758
 80-103               228 54160603N114434672W 647849760157564 6753