Image search returned a number of links that included the name "Rachel Williams", but most of them were from long defunct sites.
This one is still functioning, but I have no idea if it is reliable.
http://www.anonym.to/http://zothike....ke2/framen.htm
The "Rachel Williams" collection;
http://anonym.to/http://zothike.com/...l-williams.htm
Another site:
http://www.anonym.to/http://www.cele...spictures.html
And here she is at VEF (complete with the "mystery" picture in post #1 & post 29)
http://vintage-erotica-forum.com/sho...achel+Williams