One of the most complete histories of Woodstock is Chapter 32 of the 1917 "History of Champaign County, Ohio."
The image above is a link to a pdf version of the chapter.
More information is available from The Champaign County Historical Society.
On April 29, 1865, the Lincoln funeral train stopped in Woodstock for water and a memorial service.
The image is a link to a page in "The Lincoln Funeral Train" by Scott D. Trostel describing the stop.
This book may be purchased through the author's web site.
More information about the history of Ohio is available at the Ohio History Connection.