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Well, I think a 1916 book, obviously made of unobtainium, is not covered by the copyright laws in the same way as Windsock Datafiles. The complete archive of Flight Magazine has been made public, as well as many other publications.
I have a set of rigging notes dated april, 13th, 1918, so it's not the same diagram, altough the information must be the same.
Cheers.
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