Within a search engine such as Google, put a person's name in quotes and then follow it with a type of primary source.
For example: “ted bundy” archives
Some primary source keywords:
Also consider adding site:.gov as part of your search string to search only government web sites.
For example: "Ted Bundy" letters site:.gov
Park University Library
8700 NW River Park Drive, Box 61 - Parkville, MO - 64152
Phone: (816) 584-6285
Toll-free: (800) 270-4347