I have that they were married Sept 17,1868 found in Record A page 155 at Muscatine,
Iowa courthouse.
The following is the death listing on Joseph and William H. also found at courthouse.
Joseph M....79 yr.
Widowed
Born: June 8-1870- R.I. County Ill.
Died Oct. 13, 1949
Cause- Coronary Occlusion
Father- Minar
CoulterMother- Melvina
EdgingtonBuried- )ct. 15, 1949 in
Cedar BethelFiled- Oct. 15, 1949
Record B- Page 65
Place of Death - Muscatine
William H. Coulter Age 78
Divorced
Born- April 17, 1875
Died- July 17, 1953
Place- Muscatine
Cause- Cardiac Failure
Father- Monar
CoulterMother- Meliva Edginton
Buried July 19, 1953- Cedar
BethelFiled July 23, 1953
Lousia City
Record B- Page 410
Hope this helps or is it too late? I just found it on the computer.
Carol