I was more or less hoping to learn how toidentify land features ie hilltops, valleys, rigdes. I have understood what most of the symbols mean but you stating that the circles are hill tops brings alot of it together from me. i was unsure of how to read the lines other than on my map they are 10 feet and bold lines are 50 increases.I never know which they went in more hilly areas. Looking at my map now it looks different to me.