 Many sources had cited 1907 as Sleeper's year of birth, but she was actually born shortly after the 1910 census was taken in April 1910.Martha's true date of birth is June 24, 1910, as verified by a copy of her birth certificate.No "Martha Sleeper" appears in the 1910 census records; however, a "Martha Sleeper" is listed as 9 years old in the 1920 census (April 1920) and 19 years old in the 1930 census (April 1930).