The USGS was established in 1879 with the responsibility to map public lands, examine geological structure, and evaluate mineral resources. Over the next century, its mission expanded to include the research of groundwater, ecosystems, environmental health, natural hazards, and climate and land use change.
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Turtle RDF - 761 B - MD5: cd83778981ca256d2f6ec56417a67436
Turtle RDF - 761 B - MD5: 4e12a50bfbaf02ac044ec31a44e5f3e5
Turtle RDF - 762 B - MD5: ca408c12b1e519237ee31269dd9394c4
Turtle RDF - 761 B - MD5: 8db12aceeb48680d6c8d458ad4148149
Turtle RDF - 761 B - MD5: 4c2087d52a56696655d3d35dcb5458f4
Turtle RDF - 761 B - MD5: 65f4f96b750c347d7f778941a746db04
Turtle RDF - 761 B - MD5: b21ed91a6525ce822b66ddc741f9e0bf
Turtle RDF - 762 B - MD5: b44be56d80856384c60fb168f1ec57ab
Turtle RDF - 762 B - MD5: 13ceff9c4cea93d5a3c769ca29e733fe
Turtle RDF - 761 B - MD5: 041600f818c1e0e3658f1befb331ef21
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