[Note: this source gives a marriage date of 12 Jul 1752, which is wrong, since their daughter Lucy was born in 1751 (e.g., here). This appears from Amherst records to be the date the couple was admitted to the church in Amherst.]
1750. Aug. 25. Simeon Dickinson of Hadley and Martha Graves of Hatfield intend Marriage (posted this Day).