The copyright on the original book is, of course, expired, so several publishers have printings available. This one uses what seems like pretty cheap paper; more significantly, the pages are printed at an unusually small size - I have to believe it's been reduced from the original. The text is on the border of what my 40-year-old eyes can make out. Some of the figures appear to have some handwritten marks on them.
So, all in all, this printing feels like a photocopy, with some size reduction. The content is wonderful, and I've already learned a lot from it.