Warren County, Missouri

My husband's HACKMANN family emmigrated from Germany to Missouri in the 1840s, settling in Warren County, near the Missouri River. Many HACKMANNs are buried in throughout the four cemeteries of Immanuels United Church of Christ, in Holstein, Missouri. My husband's branch of the family eventually moved upriver to Hartsburg, Boone County, MO. But I'd be very interested in hearing from anyone who is researching a Warren County HACKMANN.