Go to your local university music library. Ask for the “Slonimsky.” Photocopy the 5 pages you actually need (the Dodecaphonic section and the Polar scales). That is legal, free, and more useful than a blurry scan.
Until then, remember Slonimsky’s own advice: “The purpose of this thesaurus is to furnish material for the creative mind.” The tool is secondary. The ear is primary. Did you find a copy? Let me know in the comments which pattern you’re working on—I’m a fan of the “Grandmother Chords” myself. slonimsky thesaurus pdf