I want to research the Katyn massacre; I've reviewed the Memo from Beria to Stalin, proposing execution of Polish officers. Are other documents (e.g. protocols of NKVD, logistics) available? Why are documents relating to this event so difficult to find? What are the canonical primary sources for this event? (or more properly, what are the sources of canonical primary sources?
- What kind of access can I get to NKVD archives?
- Who published the first reports of the event?
- What are the important sources that challenged the "official" records?