Grunberg family of Przasnysz #poland #records

Paul Silverstone

My research has taken me back to my great-great-grandfather Jacob Chrzan probably born about 1820 in Makow Mazowiecki.   I knew his wife’s name was Ruth.   
I have come upon information giving me his wife’s maiden name as Grunberg/Greenberg and her birth date of 1827 in Przasnysz.  Her parents were David Greenberg (1802-1830) and Freyda Jekowna (1804-1830.   David was the son of Abraham Greenberg (1772- ) and Chana Hinda Lejorowicz (about 1784-1831).   Chana’s father is given as  Lejzor Ickowicz  (1766-1821) born and died in Przasnysz, Poland.   I have been unable to find this family in my own sources, basically JRI-Poland and JewishGen.   I would like to find some independent source for this information before I add it to my family.   This would take my research further back than any before.
What other sources might I look at?   
Paul Silverstone
West Vancouver BC  .

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