Looking for Info on Elijah Martin Sr of Bucks CO Pennsylvania

Elijah Martin born abt 1751 in Bucks Co Pennsylvania. Elijah married Mary Elizabeth (Betsy) Von Denberg (Funderburg). His father is a George Martin, but there was the infamous Reverend George Adam Martin married to Mary Knepper. There's also a George Martin who arrived in abt 1750 and his wife's name was Rachel. I'm pretty sure my relative was the latter. There was a book written by a E.F. Martin about Genealogy of Martin Family. Any assistance would be greatly appreciated