Delaware County, NY Genealogy and History Site

Isaac, my great-grandfather lived from 1835 to 1892. Born in NJ, in Oswego Twp by 1860 with NJ wife Mary Ellen Suydam. I. DeMott's plat with building on it shown on Cannonsville map of 1869. Lady seated perhaps Mary Ellen? She died in 1895. Picture labeled Northern Survey Co, Albany NY. I can just remember Cannonsville and this looks like what I remember as Cannonsville.