There is a list of marriages that appeared in the Denton Record-Chronicle and other area publications at the Denton County Public Library. For additional info go to http://cityofdenton.com/index.aspx?page=398
The Denton County Recorder will have a copy of their marriage license too.
I did find the following:
A Mary L. Cearley was living in Sanger, Denton Co., TX in 1940.
Mary L. Cearley, b. TX, 81, widow, no occupation listed.