E-M34 Researchers,
As you may know there is project at GENI dedicated to identifying ydna lineages of older rabbinical lineages.
Matching these lineages can be an effective research strategy, not only for rabbinical scholars, but also for everyday genealogists looking to connect with a deeper ancestral tradition, far beyond what is possible using only civil and cemetery records . Your participation could also make the index more accurate for future scholars and researchers.
There are currently about 40 identified ydna lineages, several in the M34 tree. The index should be viewable here: https://www.geni.com/projects/Rabbinical-Lineages-yDNA-and-Haplogro... in the spreadsheet file named 'yDNA_Rabbinical'.
Best Wishes