The obit. in one of Milwaukee's German newspapers included Dr. Hartwig's photo.
There are about 150 Hartwig entries or references found in "Milwaukee's German Newspapers; an index of death notices and related items" (1844-1950). Ozaukee Co. residents seem to be better represented in these papers than the other surrounding counties.
Gary Rebholz, compiler/editor
Indexing Milwaukee's German newspapers continuously since 2007... because _somebody_ had to do it!