Gosh that's frustrating isn't it? I would love to put a sledge hammer to that brick wall. I love bustin' stuff up. Now if you would give me a sledge to work with like a relative birth year for John Wesley Cone and whatever other information you have for him like death date. Anything like that will harden the steel on my wall buster.
Do you think that Lena's last name is known? Null is often put in to indicate that the last name was not written down and it's like a zero quantity that is substituted.