I have two 50 sheet HP-55 Programming Pads that I got for use with my HP-25 (in 1975). I have not seen these pads on the "Museum of HP Calculators" site.
You can see (and download) the images of the pad here.
http://swtpc.home.attbi.com/hp55/hp55_pad.htm
I have 300 dpi scans available.
Michael Holley