http://ao.minisisinc.com/scripts/mwimain.dll/229/15/1?SEARCH...Above is a link to the Archives of Ontario website for newly digitized Patent Plans. This link specifically shows map from 1851 for Ingersoll / Oxford, with land owner names...little hard to read but may give you some insight into the area.
Lots of other maps for Ontario but I found it a little difficult to search. General website link is
http://www.archives.gov.on.ca/en/about/patent-plans.aspxRegards
Susan