Our greatest weakness lies in giving up. The most certain way to succeed, is always to try just one more time. - Thomas Edison
And this is a great tip when using Google Books, too. Except the book isn't on a shelf. And we're searching it not by its index but by a search box [usually]. And sometimes we don't have access to the whole book, but we do have a book description. [So the same. But not. But similar. Sorta.]
While researching for someone else, I came across a snippet from Google Books that indicated the persons of interest [of whom I had some interest ;) ] were married in Tennessee in 1829 which is before marriages were recorded in Franklin County; a county whose boundaries have changed no less than 13 times since 1807.  [Both of which make a researcher's head spin so fast it gives us whiplash, no?]
But the point is don't give up.
Go further, go longer.
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- Sharon DeBartolo Carmack and Erin Nevius, editors, The Family Tree Resource Book for Genealogists: The Essential Guide to American County and Town Sources (Cincinnati: Family Tree Books, 2004), 639.
- Lucas, Silas Emmett, "Marriages from Early Tennessee Papers, 1794-1851." (2005): 49; online archives Google Books ( http://books.google.com/books?id=6A4UAAAAYAAJ&q=maria+catherine+spyker++tennessee&dq=maria+catherine+spyker++tennessee&hl=en&sa=X&ei=hMGUUuCTBePhyQHv74CYAQ&ved=0CDoQ6AEwAA : accessed 26 Nov 2013).
- "Joseph H. Bradford marriage to Maria Catherine Spyker," marriage, National Banner, 5 Dec 1829, p. 3, col. 4.; photocopy; citing microfilm publication [awaiting descriptive number from archives] (Nashville, TN: Tennessee State Library and Archives, [awaiting year from archives]), roll [awaiting roll number] for 5 Dec 1829.