Wanted to mention that one thing Mark Does that no one else in the world does (at least that I found) is to get the scale of these mountains correct. So if you get a set of mountains like I did you can compare them all side by side and get an idea of the altitude, where sea level is, the mass and steepness of the mountains. you can't get this information just by looking at a chart of altitude above sea level. He does a really great job at this. The precision, the detail is second to none.