There are a lot of other books in the Knapp section, some of them quite thick. You can see titles by going to http://www.acpl.lib.in.us Click catalog, click Power Search, Click call number browse. change Library: to genealogy department. Enter 929.2 K72673K Click Previous TWICE to get to the beginning of the KNAPP books.

"Unconnected" however, as far as I can tell, does not contain the legal document you are looking for.
Do you know anything else about the document: date, year, place, subject, type? (We have lots of local records here on microfilm).

Here is what the does contain about some of the names you gave later (spelling/spacing/casing carefully copied, but not guaranteed):

p. 52:
1535.CHAS.HERBERT KNAPP,New LONDON,Ohio,m.Dora(or Alice)Justice.Had Archie J.b 5-20-1890.m.4-2-1912,Bessie Newcomer,age 20.-Arnold D.b.10-28-1891.-Algaic(a male)b.8-2-1894.Bellevue,Ohio.-Robert,b.2-10-1896,Clarksfield,O.-Bessie,.b.7-17-1901,Clarksfield.

p. 128:
3777.GILEAD D. KNAPP,Huron Co.O.m.Phoebe Borts,12-15-1838.She b.1821.d.11-19-1898, Clarksfield,Ohio.

pp. 217-222:
too many Marys for the time I have available....

pp. 263-266:
too many Sarahs for the time I have available....

other names not found at all.

--
Wes Groleau
http://groleau.freeshell.org/ref/lookups.shtml