Thank you!
But is the Internet archive version a PDF?
(I could not find it.)
Nope. The files at the Archive are hi-res JPEG's. Just search for 'autochrome' and lots of results come up. I do not make many PDF's any more...takes a lot of time. That would be a job for my assistant...if I had one. My time is spent on acquiring archival material, making websites, making scans and trying to do some of my own photography. Since March 2018 I've made about 27,000 scans and that is just a small amount of what needs to be done.
You can be my assistant, download the files and make a PDF and upload. You can credit source (me) and credit yourself for the PDF. I like JPEG's since they can be used to make a decent facsimile of the original. If there is an easy program to make PDF's where you can load in a bunch of files and it spits out PDF with next to no work then let me know. I've also got a huge underground newspaper archive that needs to be scanned and a small gauge film archive with close to half a million feet of film that needs conservation and scanning, so no shortage of work.