How can I find out about boundary and jurisdiction changes for East Hawksbury Twp (now Prescott Co) c1851?

The best source of information about Ontario Counties and Tps is Alan Rayburn's book entitled Place Names in Ontario, published by the U of Toronto Press in 1997 -- available at most bookstores for about $ 22.00. Hawkesbury Tp in Prescott Co was created in 1798. It was divided into East and West in 1884. There is also a community called Hawkesbury. It had a Post Office beginning in 1819 and became the Town of Hawkesbury in 1896. In the early days it was the site of a very large lumbering operation run by George and William Hamilton