[Mitchell]

And the letters were xeroxed on paper of a size rarely found in the USA but common in Europe.

As I recall, they were A4 size, or possibly A3 (which I think is drawing paper, twice as wide as A4 but the same height), cut in two or trimmed. This is from memory; I don't have a reference right now.

[The Great Satan]

Yes, I recall that. European stationary (A4, A3, etc.) has an aspect ratio of sqrt(2) : 1, so that the same aspect ratio is retained when a document is folded in half (1.414 : 1 is the same as 1 : 0.707).