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Since 1940, what has been the trend in labor union membership as a percentage of the total workforce?
Net Useful Energy
The amount of energy available for use after subtracting the energy lost during generation, transmission, and conversion.
Subsurface Mining
A method of extracting minerals and ores from beneath the earth's surface, as opposed to open-pit or surface mining, often requiring tunnels or shafts.
Disease
A disorder of structure or function in a living organism that typically leads to signs or symptoms and is not a direct result of physical injury.
Groundwater Supplies
Underground sources of fresh water stored in aquifers, crucial for drinking water, irrigation, and industrial uses.
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