Well, this is the letter I wrote:

Hello Steve Leggett,

My name is Michael Kaminski and I am writer from Toronto who specialises in cinema studies. I understand that this year 1980's Empire Strikes Back was added to the National Film Registry and I had a few simple questions I was hoping you could clarify for me about the print. Firstly, I was wodering which version of the film this print represents? As you may know, the film was re-released in 1997 in a heavily modified form. I was also wondering whether the print was donated by Fox, Lucasfilm or a third party, and whether said print was already existant or if it was newly printed for the occassion.

Thanks in advance for your reply,

Michael Kaminski