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I believe this card refers to the Bureau of Naturalization Correspondence Files described here INS Case, Correspondence, Policy and Administrative Records Overview | USCIS . If I'm correct, the 612.341 number is a file code. It appears that the correspondence itself would be at the National Archives in Washington D.C., in Record Group 85.
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Thanks for this detail and link. I took a quick peak at the page and it looks very promising. Thanks so much for posting a reply to my question. I'll post more if I learn more about the files.