Have you looked at "We Sought the Wilderness," by Claton Silas Rice (1949)? It doesn't have much on George Gaby but does talk at length about Matilda Gaby and Benjamin Rice, whose son George Gaby Rice was my 4x great-grandfather. The book is not yet available on Google Books, but if you have access to WorldCat through a university, you can probably get access through that to the scanned copy on HeritageQuest. Good luck with you search. Lisa