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JulieMylar and acid-free board, which I'd have to look through, which would be noisy--and I'd need light. I'll look as soon as I can and put the date IN THIS POST, not another one.
Unfortunately, the page with the date is facing the backboard, and the thing is sealed in, but looking through the paper, it seems to be October 23 (or possibly 29) 1910. I'm sure about the month and the year but not the day of the month.