You might want to search the Ricks Memorial Library in Yazoo City at http://www.youseemore.com/yazoo/about.asp?p=11
Here's another site that might have links to what you are looking for,
http://www.mymississippigenealogy.com/ms_county/yaz.htm
I think I would also contact the Yazoo Historical Society at,
Yazoo Historical Society
Louise Mott
P. O. Box 575
Yazoo City, Mississippi 39194
Phone: 662-746-2919
or, if all else fails, oyou have the MDAH