A cousin kindly provided this link. I don't think it's in the Reference library.
This one is specific to the Cock Family of Gwithian
But the Cornish Genealogy Database may pertain to more (Morvah, Penwith, Cornish Will Abstracts and more, including several family trees):
This one is specific to the Cock Family of Gwithian
But the Cornish Genealogy Database may pertain to more (Morvah, Penwith, Cornish Will Abstracts and more, including several family trees):