Daniel K. Keuerleber-BurkSpalentorweg 32CH-4051 BaselTel +41 61 272 13 07Tel +41 79 964 3 967Skype d.g.keuerleber

Over the last 40 years quite a lot of resources were used for this genealogical research. Some of them are not accessible any more.
Resources free of charge:

Research in Switzerland

Research in Germany

Research worldwide