Try this website: www.tribalpages.com/tribe/familytree?uis=engelhardt&surname=Engelhardt. We found several people whom we can positively identify as members of my spouse's family. No one in his family could agree on how many children his great-grandfather had, but there were several. (estimated between 10 and 16) You could be descended from a great-great-uncle of my spouse's. There are many Engelhardts who live in and/or whose ancestors hailed from northeast Iowa. I hope you have a fruitful search.