[lambda]

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.