tarryvale on Family Tree Circles

The Downs family was present with or shortly after Thomas Roberts who was in Dover Neck N.H. in 1623. My great grandmother was Eliza(Betsy) Blake Downs. The Ricker Genealogy by Percy Leroy Ricker and Edwin R.Holland,Heritage Books,Inc. Maryland, 1996 says her mother was Hannah Ricker and father Edmund Downs. They were married in Dover,N.H. but I think lived in Berwick Maine. Eliza was born in 1820 and died 1865. I have not been able to find either Eliza's or Edmund's records. Anyone out there have any ideas?