I downloaded this manual and several others I posted, from Hathi. Most everything I downloaded was at 300dpi, you can go higher but the file sizes become too large for the site. It's also the biggest pain in the ass to download manuals from there without a password to the site because you have to download them as picture images, 1 page at a time and then make a pdf of the images, very time consuming. Wish I had a password because there are still many manuals I would like to download as a pdf instead of 1 page at a time. If you search for my posts, you will find several more aircraft manufacturing books. Keith