I developed a javascript webpage to create the number list for a creating a perfect bound book. For example, take 8.5x11 and turn into a folded 5.5x8.5 page. I also have an example on making your own book link.
It works for both duplex and simplex printers. I did find an issue with acrobat that the page selection only works for up to 48 pages. So I paste my list into select pages in scribus and generate the PDF directly.
Printing duplex print short side.
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