1. I assume if Rebecca Martin appeared in the 1842 territorial census that she was the head of household. About how old was she? Could she have died? Could she have married and changed her name? Could she have moved elsewhere?

2. Dane and Rock counties border each other. Perhaps his property straddled the county line. What do the two 1850 census entries say about the value of his real estate? The most obvious place to look would be property records (not online, but microfilmed).