Ohio county histories on line at BYU

For some reason, more than half of Ohio's counties have histories on line at BYU, making it by far the best-covered Midwestern state in that department. I was able to find:

Adams, Allen, Ashland (2), Ashtabula, Athens, AuGlaize
Belmont, Butler (2)
Clark (2), Clinton, Columbiana (3), Coshocton (2), Crawford
Darke
Fairfield, Fulton
Greene, Guernsey (3)
Hamilton (2), Harrison (2), Highland
Jefferson
Licking, Lorain, Lucas
Mahoning, Marion, Miami (3), Monroe, Morrow, Muskingum (2)
Noble
Paulding, Perry, Portage
Richland, Ross
Sandusky, Stark (2)
Trumbull, Tuscarawas (3)
Union
Van Wert
Warren, Washington (3), Wayne

Unfortunately, it's not a simple matter to reach their advanced search interface. A direct link doesn't work, so here's my route: first go to the Harold B. Lee Library Online Collections. Even though you want ultimately to search all collections, select the left-hand tab for "Multimedia and Images" in order to get a search box. Don't type anything into the search box, just hit "go." In the resulting window, ignore any actual results. Instead, click on "advanced search" in the newly apparent menu at the top. Then, in the advanced search window, type in "Michigan county" or whatever you want to search for in more sophisticated ways.