/usr/share/idzebra-2.0/tab/usmarc.mar is in idzebra-2.0-common 2.0.59-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 | name usmarc
reference USmarc
# Defines implementation codes (offset 6..9)
#implementation-codes ABCD
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