This does the trick.
#! perl -slw
use strict;
my %desc;
m[^\s*(.*?)\s+([A-Z0-9]+)\s+(?:[0-9,]+\s*)?$]
and $desc{ $2 } = $1
while <DATA>;
my $code = 'GMF';
print "$code : $desc{ $code }";
__DATA__
Total index B50001
Crude processing (capacity) B5610C
Primary & semifinished processing (capacity) B562A3C
Finished processing (capacity) B5640C
Manufacturing ("SIC") B00004
Manufacturing (NAICS) GMF
Durable manufacturing (NAICS) GMFD
Wood product G321
+ 321
Nonmetallic mineral product G327
+ 327
Primary metal G331
+ 331
Iron and steel products G3311A2
+ 3311,2
Fabricated metal product G332
+ 332
Machinery G333
+ 333
Examine what is said, not who speaks.
"Efficiency is intelligent laziness." -David Dunham
"When I'm working on a problem, I never think about beauty. I think only how to solve the problem. But when I have finished, if the solution is not beautiful, I know it is wrong." -Richard Buckminster Fuller
If I understand your problem, I can solve it! Of course, the same can be said for you.
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