Just took a quick look to get the INVEST contact information many are
looking for:

INVEST Learning Corporation
9920 Pacific Heights Blvd., Suite 100
San Diego, CA  92121-4330
(800) 927-9997

I just contacted the company and found that the number is correct.  It
also has a new site on the World Wide Web.  The address is:

I will try and obtain the reference material I described earlier as soon as

Alan Johnson