1843. Mary Nelson b ca.1814.   In 1860 census, a Mary Nelson (46) with Susan Nelson (19) and William Walker (70) is next door to Margaret Nelson.   Back in 1850 census a Susan Nelson (8) is with Samuel & Elizabeth Bible, no record of Mary.   But, a Mary Nelson did marry Samuel Harper in 1837; she is also 45 in 1860 census, so she needs to be identified