I have a Mahlon Roberts marrying Anna H. Hoskins in that area.
Nothing further on Mahlon. Anna's parents were Ellis & Ruth (Jones) Hoskins. Anna is buried at Pleasant Plain Friends Cem. I get up that way quite often if you want me to look for someone in particular. Not a very big cemetery. I have several other relatives there.
About 35 other Roberts names in my files, although some are from around Cedar Rapids.
Would be glad to share whatever info I have.
Sam Cook, Milan, MO