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Themes, subjects, and concerns for which USGS information resources are relevant.
Subtopics:
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Biological and physical processes
Culture and demographics
Earth characteristics
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Information system design and development
Instrument design and development
Land use and land cover
Map coordinate systems
Contamination and pollution
Natural resource exploration
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Organism groupings (non-taxonomic)
Organisms
Planetary bodies
Population and community ecology
Scientific careers
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Water quality
Water supply and demand
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