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a standardized system whereby settlers could purchase title to farmland in the undeveloped west.
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several laws in the United States by which an applicant could acquire ownership of government land or the public domain, typically called a "homestead.”
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law that authorizes and governs prospecting and mining for economic minerals,
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agency of the United States federal government that manages all national parks.
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international governmental organization tasked to promote international co-operation and to create and maintain international order.
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environmental science book by Rachel Carson.
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independent agency of the United States federal government for environmental protection.
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annual event celebrated on April 22. Worldwide, various events are held to demonstrate support for environmental protection.
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develop programs which will increase the conservation and efficient use of energy
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intergovernmental organization that regulates international trade.