Johannes Leonardsen: Birth: 8 DEC 1727.
SARAH LEONARDSEN: Birth: ABT 1743.
Title: Summers, William Clark, The Sommer-Sommers-Somers.... That Missed the Boat, Ancestors & Descendants of Rev. Peter Nicholas Sommer (Priv. Pub., 1979)
Title: Pearson, Jonathan, Contributions for the Genealogies of the First Settlers of ... Schenectady (1662-1800) (Gen. Pub. Co., Inc., (reprinted) 1984)
Title: Kelly, Arthur C. M., Marriage Record of Schenectady Reformed Church (1694-1852) (1988)
Title: Birth certificate
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