Other quick links from my own:
http://www.paclink.com/~ascott/me/musfs.htm (apparently defunct Science Fiction Society in Huntington, WV where Harry gave a workshop on Fritz/Fritz' writings).
http://www.lib.utexas.edu/taro/uhsc/00021/hsc-00021.html (Fritz Leiber Papers at the Unv. of Texas).
http://brucebyfield.wordpress.com/2007/09/11/witches-of-the-mind/ (a wordpress blog with a very interesting associated article from a person who did research on Fritz and Harry for his own thesis publication).
http://scrollsoflankhmar.com/ (Great site).
The illustration is from the "Critical Essays" on Fritz, OOP.
Sorry I could not be of more help, Mark.
