By Stephen Regenold Beginning in the 1940s, the U.S. Geological Survey’s National Mapping Program was tasked with the immense cartographical feat of surveying the entire country to create a ...

This article was originally published with the title “Use of Stereoscope for Viewing Contour Maps” in SA Supplements Vol. 85 No. 2215supp (June 1918), p. 372 doi:10.1038 ...

Outdoors Notebook: Contour map mobile apps available on North Dakota Game and Fish website, Interactive shooting range tool available, etc.