What does MCR mean

HELP:

I would very much appreciate the definition for MCR

In front of sequenced numbers.

I am unable to find them any where.

As the MCR 1653 in the FIVE CIVILIZED TRIBES, it has to be similar to a record number??

MCR is a microfilm identifier.

http://www.archives.gov/research/native-americans/dawes/

I hope that this helps.

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