Dr. Albert J. Zinns' (and his wife's) death notices and/or obituary are published in Milwaukee's German language press. They are indexed in "Milwaukee's German Newspapers; an index of death notices and related items" (1844-1950). These newspapers and the index remain in libraries, and not online. In the case of a local MD like Dr. Zinns, it would be important to check for BOTH a death notice and a death notice in the local English language papers.
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Indexing Milwaukee's German newspapers continuously since 2007... a resource for family researchers who collect authentic evidence contemporary with their historic German-American families.