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roads(15)
population density(6)
urban areas(5)
land use(4)
probability density(4)
urban environments(4)
forests(3)
agriculture(2)
air pollution(2)
built structures(2)
death rates(2)
geographic information systems(2)
habitats(2)
rural areas(2)
simulation and modeling(2)
traffic safety(2)
acoustics(1)
adults(1)
agricultural soil science(1)
air quality(1)
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