Hi: For some time now, I have been typing Barry Co., MO, newspaper items for the years 1890 through 1913. And in among the listings there were a lot of Lock surnames.
And I just added the Lock Slave Cemetery to the site. It is a great page and so you might want to log on to the site and take a look. It's listed in the Barry Co., MO section.
When I have the newspaper project finished it will include up through 1921. But there are already a lot of papers listed and tons of information that will interest researchers of Barry Co., MO and the surrounding areas.
There is a search engine on the front page, and you will probably need it - but if you just want to walk through them, then just go down the page and you will see listed the Barry Co., MO Newspaper project.