Pfeiffer History update

I spoke with Paul Koeller, the lead author of The House of Heileman, a history book about the G. Heileman Brewing Co. A few things that I learned from him that updated the existing history. Heileman brewed Pfeiffer until 1979, seven years longer than the last recorded Michigan appearance of the beer. He also gave me the name and contact information of the head brewer at City Brewery in LaCrosse, Wisconsin. The brewery does contract brewing for Pabst and others and the brewer is said to have a collection of recipes that are as old as 100 years and hand-written. This may be my shot to find it.