"You can now read the entirety of sci-fi magazine If for free
All 176 issues of the magazine, which ran from 1952 to 1974, are available to download."
discussed here:
http://arstechnica.com/the-multivers...e-if-for-free/
download via via internet archive:
https://archive.org/details/ifmagazine
So, yes, but....
I tried one epub download and it was the usual for Internet Archive - rough OCR scan lacking illustrations. These If Magazine scans tend to lose the space between words - ugly!
I imagine some industrious individual will someday render usable epubs from these files, but it will be a LOT of work!
The pdfs are beautiful, of course, but at over 20M per you probably don't want to download the whole collection!
(Please forgive if this has been mentioned previously.)