Update 03-working-with-MARC-files.md

[abigailsparling]

Partial Update. Will continue to add to this PR

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 03-working-with-MARC-files.md | 23 +++++++++++------------
 md5sum.txt                    |  4 ++--
 reference.md                  |  3 +++
 3 files changed, 16 insertions(+), 14 deletions(-)

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⏱️ Updated at 2026-04-09 22:16:20 +0000

[abigailsparling]

Closes #203 Do we need/want to link from the lesson to the glossary for my new Character Encoding entry? It doesn't look like we've done that for the rest of the lesson.

[jenmawe]

That is a good idea @abigailsparling