Thanks guys. Jerry, I've confirmed 17 Mall Theatres, including one Rucker.
So Gimbels was the last to give up her location, at least to me. For those who did not know, or who just want the info in one place, here is the location of the advertisers for the various m101-4/5 backs:
Altoona Tribune: Altoona, PA
Blank (Mendelsohn): Chicago, IL
Block & Kuhl: Peoria, IL
Burgess-Nash: Omaha, NE
Everybody’s: El Paso, TX
Famous & Barr St. Louis, MO
Gimbels: Milwaukee, WI
Globe: Harrisburg, PA
Green-Joyce: Columbus, OH
Herpolsheimer: Grand Rapids, MI
Holmes to Homes: Arlington, VA
Indianapolis Brewing: Indianapolis, IN
Mall Theatre: Cleveland, OH
Morehouse Baking: Lawrence, MA
Sporting News: St. Louis, MO
Standard Biscuit San Francisco, CA
Successful Farming: Des Moines, IA
Ware’s Basement: New Rochelle, NY
Weil Baking: New Orleans, LA
Blank-backed full sheets:
Bucyrus Brewing: Bucyrus, OH
Chicago Examiner: Chicago, IL
Furniture City Brewing: Grand Rapids, MI