The early baptism records of the Reformed Dutch Church of Harlingen (Somerset County, New Jersey) were published in the New York Genealogical and Biographical Record in 1909. Later years were published in the Genealogical Magazine of New Jersey. Baptisms from 1737 until May 2, 1762 were published in volumes 17 and 18 of the GMNJ.
Baptisms RDC Harlingen, New Jersey, GMNJ vols. 17 & 18