Bible records of Ephraim Lewis & Hannah Davison - Hawkeye Heritage, FHL 977.7 D25h, v.7., also on the internet - includes birthdates of all children & deathdate of Mary and Wife & Marriage dates.
1820 Census - Venango Twp., Erie, Pennsylvania, "Tyler Lewis".
1830 Census - Venango Twp., Erie, Pennsylvania, "Tyler Lewis".
1840 Census - Linn County, Iowa.
1850 Census - Linn County, Iowa.
1856 State Census - Marion Twp., Linn, Iowa.
1860 Census - Maine Twp., Linn, Iowa - Martha & Mary residing with Moses E. McKinney.
Venango Township, Erie County, Pa, Tax Records - Tyler Lewis - 1823-1831; Wilbert L. Lewis listed in 1835.
Middlebrook Church Records, Venango Twp., Erie, Pennsylvania.
Linn County Iowa Marriages.
LaSalle County, Illinois Marriages - Zipporah H. Lewis.
"Pioneer life in and around Cedar Rapids, Iowa, from 1839-1849", page 14-16. - Ephraim T. Lewis.
Linn County, Iowa Land Records.
Probate of Ephraim T. Lewis - Linn County, Iowa.
Probate of Margaret G. Lewis - Linn County, Iowa.
Death Certificate of Sarah Jane; Obituary of Sarah Jane.
Death Record of Zipporah H. Lewis - Butler County, Iowa.
Evergreen Cemetery Records of Sarah Jane - Fairfield, Jefferson, Iowa - gives parents names as E.T. Lewis and Read.
Oakhill Cemetery, Pittsford Twp., Butler, Iowa - Zipporah H. Lewis Niece.
Springfield Cemetery, Brown Twp., Linn, Iowa - Burial of Horace Nathan Brown & 2nd wife.
Jordan's Grove Cemetery, Maint Twp., Linn, Iowa - burial of Margaret O. Lewis Finson.
Family Records.