The Pennsylvania Provincial tax records on Ancestry (subscription) are fascinating for the information not available online from the State Archives. In an effort to untangle the sometimes confusing index dates & townships from Ancestry for 1768 - 1801, please note the added text from the Proprietary, Supply, and State Tax Lists of the Counties of Northampton ... for the Years 1772 to 1787, Google eBook, W. H. Egle, W.S. Ray, State Printer of Pennsylvania, 1897
Proprietary Tax, Northhampton, 1772 Delaware Township records appear to include the area just below the present day Egypt Mills north to just below Milford. The Upper Smithfield records include the area from Milford north to Matamoras. Both sets of records are termed Duplicates, from an unknown date.
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Note "Negros & Mulattos" as taxable commodities, i.e. slaves, for the following slave owners: John Brink, 2; Henry Cortright, 1; Benjamin Decker, 1; John Rosencrance, 2; Bernardus Swartwood, 1; Adam ?, 1; John Van Etten, 1; Eli? Vanauken, 1; David Vanauken, 1.
Andrew (Andries) Dingman is not listed, Broer Decker (Brewer Dacker) and Joseph Rider (Joseph Reder) are. Records for all three of these settlers are scarce. Rider, in 1784, was granted the Patent to the Quick's Mill tract along the Vandermark Creek in present day Milford.
Abbreviations for the State Archives text
Tax & Exoneration Lists, 1762–1794. Series No. 4.61; Records of the Office of the Comptroller General, RG-4. Pennsylvania Historical & Museum Commission, Harrisburg, Pennsylvania.