The following maps were scanned and submitted by Tom Upshaw who writes:

Elwood 1893  This is a map of Elwood

Brookfield Twp. 1893 top (131068 bytes) This is the top half of a plat map of Brookfield Township

Brookfield Twp. 1893 bottom (129877 bytes) This is the bottom half of a plat map of Brookfield Township.

The web page that Scott Ketelsen referred to recently
http://www.geocities.com/selmaketelsen/ (website and photo are no longer there) actually has a picture of my grandfather Dr. William H. Presnell surrounded by Ketelsen kids; he was the doctor for a sizable chunk of the county and delivered many Clinton Co. residents (older than about 35) when they were born. He had a small doctor office in the town where my grandparents lived, Charlotte (between Delmar and Goose Lake I think). 
Thanks, Tom