This source is a printout of records on film 186122 - records extracted from Northampton, Hadley, and Hatfield by Lucious Boltwood. (See source entry here.)
The Hatfield marriages, 1668-1841, can be searched on the IGI using Batch No. M502532 here.
Hatfield births can be searched using Batch No C502531 here.
The film may be ordered through the nearest Family History Center.
FHL film numbers