Recently found some long-lost images of 5 1/4" floppies that were sent
to me... 10-15 years ago. Here's one of them:
http://www.corestore.org/RP06.552
Looks like a straight image for a 1.44 what we call "stiffy". The 522
is the version of RP06.
Google leads me to
http://www.corestore.org/rp12.htm so you already
know what it's for :-)
W