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Website and sources are in Polish.
NB: The "about" section includes a page called "guide for researchers" which is helpful in thinking about further work with this archive's digital and physical holdings. Note also this website's page (https://nsarchive.gwu.edu/postings/sourcebooks)…
Note: This online resource has not been found to meet all criteria for legitimacy. It may reproduce copyright-protected content without license or permissions
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