This cache is a bonus for completing the Historic Cookeville Adventure Lab. You will need to answer all 4 questions in the lab to obtain the final coordinates for this cache. You can download the Lab here: https://adventurelab.page.link/UoS2
If you don't have the Adventure Lab app, you can download it for free from your play or app store.
This cache is rated D3.0 because of the time you will spend walking around downtown Cookeville, not because of the difficulty of the hide, which is more like a D1.0.
Please replace it exactly as you found it.