I just went thru the index carefully looking for Tibbetts. I have volume 1. Tibbetts is in Volume 2, which I am going to order right away as what I need is in that Volume. Volume 1 has the index for the entire set.
Tibbetts Ancestry covers: Benjamin R., Henry, Henry, Ichabod, Capt,
James, Jeremiah, Nathaniel, Raymond R., Samuel, Capt., Woodbury.,
I will let you know when the 2nd volume comes in. You might want to look to see if Wikitree has it.