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This is amazing. Even more amazing that all of this was done in 1969.

How is this PDF entirely high-resolution and vector? Is it essentially a digital remake of the original document? Or was the original document written in some crazy precursor to PostScript?

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Looks like a digital remake. https://www.hq.nasa.gov/alsj/a11/a11-fltplan.htm contains a high-resolution scan of the original, plus this version with the annotation "Re-formatted by Thomas Schwagmeier".

If you compare them, the styles are very different; different fonts, color graphics instead of line art, etc. Looks like this is just entirely recreated based on the originals, not a dump of any data from the originals; I'm willing to bet that most of the originals were drafted by hand, not digitized in any way.

I'd guess it's a remake just based on the fact that the filename has "reformat" in it, and common sense

Here's the original in scanned PDF format amongst with some other versions:

https://www.hq.nasa.gov/alsj/a11/a11-fltplan.htm

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