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Major land uses in Montana from the National Atlas of the United States, (1970) page 158.
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Montana Population in persons per square mile from the 2000 Census. This data is a smoothed-over representation of Montana's population density surface, designed to emphasize small areas with high population density. It was derived from U.S. Census Bureau 2000 TIGER files and population counts. The original data was resampled to a 100-meter grid, smoothed, and the highest resulting density of the 100-meter cells in each 1-kilometer grid cell was assigned to the cell. When comparing this data set to the similar data set available from NRIS for the 1990 Census, it is important to realize that the change of population density at a location is likely to be the result of a change in the configuration of the Census...
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Ecological units were drafted on 1:500,000 scale Geologic maps by soil scientists of the Northern Region forests, based on their knowledge and soil, climate, geologic, and vegetation maps available to them.
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Mining Districts of Montana, developed by the Montana Abandoned Mines Reclamation Bureau. Based on a map of minining districts made in 1935, with some districts revised or removed, with addtional districts added. The districts were revised again in May of 1995. Mining districts were formed by associations of miners in a region who developed rules and laws to govern mining in the district. They sometimes established a monument to serve as the reference point for surveys in the district and created a description of the district boundary. Mining districts are no longer legal entities. Historical narratives describing the mining districts and their boundaries are available at http://deq.mt.gov/abandonedmines/linkdocs/default.mcpx.
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