Just found my list of Bavarian Mühlradstempel (Wagon Wheel Cancel)Transcribed (not by me) from The Bavarian Mühlradstempel By: Beck & Holzschuher, Munich 1911 (in German). If you read German, The original is available at Openlibrary and Archives.
Way to long to post here 600 locations, MS Word, 4 pages at #10 font. If anyone wants a copy I will be happy to email it to you.