Help me find out some history on the Stock Certificates!!!

These Stock Certificates were found in my Great Aunt's house when she passed away. I have tried to do some research on the companies and have a little success. I am not sure if these are still valuable for there original reasons as shares in a company or if they are valuable as a collector's item, or if they have no value at all. I have found that the Oklahoma Oil and Refining Co. was bought by Humble Oil which then was purchased by Exxon Oil. The others, I have not heard much about. Any help would be great on the history of these certificates.

Thanks,

Ben