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Thank you for your question to History Hub. We have information on both the 231st port company and 492nd port battalion contained in the following series of records located at the National Archives in College Park, MD:
We have good finding aids for these records and should be able to locate the exact box or boxes that these records are in. If you have any further questions, please email us at firstname.lastname@example.org. Thank you.
Thanks very much, Ryan! I appreciate the answer. I think it's exactly what I was looking for.