Hersey, Reuben. Mss 901. R. Stanton Avery Special Collections Department
Scanned and indexed facsimile of a handwritten manuscript.
Note: page numbers used by NEHGS viewer do not match the original page numbers written in the corners of each page.
For example, for the first volume, the NEHGS image set doesn't have page 1, and pages 2-4 are endpapers that contain various records. As a result, the NEHGS assigned page number is 4 greater than the original page number. But that relationship doesn't hold true, later in volume 1, and the images for volume 2 merely continue the sequence used in volume 1, so patterns are even less discernible there.
Since this only seems to be available through the NEHGS index, unless both page numbers are specified, pages numbers cited for this source probably refer to the numbers assigned by NEHGS, not the handwritten page number.