St Louis COUNTY issued a license to
William S Burroughs and Nina F Keltner
6/6/1896 Book 3 Page 578
To order a copy of the original contact:
St Louis County Recorder of Deeds
Attention: 4th Floor, Marriage License
41 S Central Ave
Clayton, MO 63105
Phone Number 314-615-7100
The last time I ordered a copy it cost $2.00.
Best of luck!