WGertz on Family Tree Circles

My Grandmother Caroline (aka Karoline)Knopf, b.1877, came to the United States in 1899. I believe her father was Andreas Knopf (ake Andrey Ivanovitch Knop), and mother Louisa Kristen (Cristianova) Gertz daughter of Christian Gertz. Andreas's father is believed to be Johann Knopf (Knop)son of Martin Knopf. Andreas's mother was Gertrude Manthy daughter of Methias Manthy. Caroline's passage record states that she resided in W.Aloka Russia Poland. She married my Grandfather Louis Gertz, b.1870 (aka Ludwig Gertz), a cousin, in Cleveland in 1900. Louis came to Cleveland from Platzk (could also be Plock or Plonsk) Russia Poland in 1896. Louis's parients were Jacob Gertz, son of Chriatian Gertz and Katarzyna Marschalk, and Cristine Gutke, daughter of Christian Gutke and Elizabeth Michelson. Caroline and Louis moved to Gladwin Michigan in 1908. I am looking for any information for eather of their families in Russia Poland.
WGertz