So, today, I was looking at my hints for any last minute additions before I was stuck with Ancestry Library Edition....
I happened to look at a hint for my 3rd Great-Grandfather, Henry Seamens (1839-1904 Cayuga County, NY). The only hint was a family tree hint. Normally I don't look at those unless they are more closely related, but this time, I did click through and they had Henry's residence as Bristol, Massachusetts, 1687-1933. This was an obvious error, but I thought I'd click through and see what record provided this anomaly...this was it:
Henry's daughter, Dora is my GG Grandmother. This book traces back the family to 1687. Not indexed by Ancestry.com, so it never showed up as a hint.
This book was listed as privately printed in 1933 in Syracuse, New York. I was pretty bummed that I wouldn't get a chance to look at the whole thing in three days. On a whim, I plugged in the author's name into Worldcat.org:
The supremely awesome Clayton Library for Genealogical Research here in Houston, amazingly, has a copy of this book. Heh. Pretty close to serendipity for me!