The website: http://www.academictherapy.com/ has the “search” capacity for exact matches. One little character or space throws it off. It is there—I saw it just now. When you get to the home page, look in the left column and click on assessments. On that page, find the list of things (i.e., reading, etc.) and find interpretation. It will pop up then.
Cost is $40.00. Not cheap. Mine is so dog-earred that I need to re-order.