For the NTDB datasets, you can download the file Intervals_NTDB. Pdf which shows the list of all datasets with their contour intervals and the measuring unit. For the NTDB data sets at the scale 1:250,000 all data are in metric measuring unit.
In the metadata file (html or xml), you will find the information in the Abstract of the Identifiation Information section. More.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.