I found the following at the Rhode Island State Archives and Public Records Admin. building at 337 Westminster St., Providence, Rhode Island.
GROOM_______________BRIDE________________ KEACH, Edward F._____Maria J. SWEETSER BK: 66 ___ PG: 494 ___ CT: DATE of MARRIAGE: 01/01/1866 Edward was 23 at time of Marriage - Birthyear 1843 Birthplace - Chepachet, R.I. Maria was 19 at time of Marriage - Birthyear 1847 Birthplace - Slatersville, R.I. Place of Residence of Both was Chepachet, R.I. Occupation of Groom was Carpenter
Groom's Parents - Benjamin KEACH and Mary Ann UNKNOWN Bride's Parents - Charles SWEETSER and Mary UNKNOWN