"Surnames: Gebhardt, Klein, Kroha, Kremmer
Looking for birth, death and marriage for any of the above"
Wow! That request represents many hours of research time, parking fees and copy costs, maybe even busfare (!) when you consider all of the source collections for vital records at the local and state level, court records, church records, cemetery records, newspapers, etc.
For example, there are entries of these surnames found in the ongoing project called "Milwaukee's German Newspapers; an index of death notices and related items" (1844-1950). There are about 50 Kroha, 15 Kremmer, 650 Klein, 125 Gebhard / Gebhardt entries or references in the current data file. The index and the large collection of newspapers remain in local libraries, but check your local library for access to online resources.
Gary Rebholz, compiler/editor
Indexing Milwaukee's German newspapers continuously since 2007...