1880. Provides access to a digital collection of historical color fire insurance maps, real estate atlases, and similar land use maps for North America. ... Historical Information Gatherers, Inc.
2000. Oak Ridge National Laboratory and East View Geospatial. Landscan is a world population dataset at approximately 1 km resolution (30" X 30"). It represents an ambient population (average over 24 hours). T... East View Geospatial.