There was a reference to Edwin M. Stanton in the guardian probate file of Leonora C. Buckingham (Volume 1, #146) in Jefferson County, Ohio, regarding the minor children of Thomas Oliver, Jr., deceased:
"On the motion of Stanton & McCook, Esqrs.,.....". 16 Nov. 1847
From a Carroll County, Ohio, website:
George Wythe McCook
Born at Cannonsburg, Pa., November 2, 1821. He graduated from Ohio University, at Athens, and studied law with and afterwards became the partner of Edwin M. Stanton, the great war secretary, in Steubenville.