Curated OER
Etc: Maps Etc: Density of Population in the u.s., 1901
A map from 1901 of the United States showing the population distribution at the time. The map is keyed to show areas of population densities ranging from sparse to very dense. This map is part of a classroom map study illustrating how,...
Curated OER
Educational Technology Clearinghouse: Maps Etc: Denver Basin, 1911
A geologic map of a section of the Colorado Front Range near Denver and Golden showing the structure and topography of the common border between the Great Plains and Southern Rockies. The map is keyed to show rock types, formations, and...