from the Great Migration Directory
Bliss, George: Unknown; 1639 Sandwich, Newport [PCR 1:149; Austin 22, Aaron Tyler Bliss, 'Genealogy of the Bliss Family in America', 3 volumes (Midland, Michigan, 1982) {but see TAG 59:25-27}]. (The proposed English origin for this immigrant should be revisited.)
Unknown means Unknown English origin. He arrived 1639 with New England residences Sandwich and Newport (matches your profile)
PCR refers to 'Records of the Colony of New Plymouth in New England', Nathaniel B Shurleff and David Pulsifer, eds., 12 volumes in 10 (Boston 1855-1861)
I checked that reference, but I don't see it in Vol 1 Records of the Colony of New England
TAG refers to The American Genealogist, Vol 9 to present (1932+)