Back in 1974, Aurora made several model kits based on super-heroes, including Superman, Superboy, and Batman.
The original art for the Superman book (by Wolfman/Swan/Giacoia) is now online, at the addresses I'll give below. That's good news. The bad news is this art has been stolen. See
this post at Comic Book Resources for the details and reward offered.
Here are the pages (pages 2 and 3 were instructions):
Cover (page 1):
http://www.virtualcomicartcon.com/0112.jpgPage 4:
http://www.virtualcomicartcon.com/0113.jpgPage 5:
http://www.virtualcomicartcon.com/0114.jpgPage 6:
http://www.virtualcomicartcon.com/0115.jpgPage 7:
http://www.virtualcomicartcon.com/0116.jpgPage 8:
http://www.virtualcomicartcon.com/0117.jpg