Heinrich Schimpf

My great-grandparents, George Heinrich born 1861 and Susanna Elizabeth (Keil) Schimpf born April 19, 1861 came into the US through Ellis Island in 1908. They came from Galka, Russia to settle in the Arkansas River valley in southeast Colorado to farm. They came with their daughters, Katherine and Amalie (my grandmother) who was 8 at the time. I would appreciate any information that would lead me to their family history in Galka.