While checking out the 50 Years Porsche 914 book on Amazon, the following print popped up. I may order one. The seller also has some other Porsche prints that may be of interest.
https://www.amazon.com/Porsche-914-Patent-U...tems&sr=1-2
https://www.amazon.com/s?k=porsche&me=A...;ref=nb_sb_noss