Open Question: Need help with life insurance companies.?

My grandparents gave me two of their life insurance policies. They want me to find out if they have any cash value and if the companies are still around. Both documents are from the 1950s. One of the polices is with The Bankers Health and Life Insurance Company of Macon, Georgia. The other is with The National Life and Accident Insurance Company. How can I find out more information on these to