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LymanMike, for a summary on Police Gazette supplements including value estimates for VG common supplements, go to http://www.oldcardboard.com/m/m128/m128.asp?cardsetID=1116.
Also, John Esch wrote a detailed article on Police Gazette Supplements (the most comprehensive ever written) that was published in Issue #4 (Summer 2005, p. 28-35) of Old Cardboard magazine.
Hope this helps.
Lyman