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The USGS logo, also referred to as the USGS identifier, is trademarked. The USGS Visual Identity System, including the identifier itself, is reserved for use by the USGS and its official partners and cooperators only. Use of the identifier by other entities is prohibited without prior written
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permission. The identifier may not be used for commercial purposes and may not be provided to a commercial source for reproduction except as authorized by the USGS. If you would like more information about the USGS Visual Identity System, you may contact
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in some jurisdictions. If you want to use it, you have to ensure that you have the legal right to do so and that you do not infringe any trademark rights. See our
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File:Twin Towers Correction Facility - U.S. Geological Survey - Aerial Photo.jpg
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Biblioteca del Servicio Geológico de Estados Unidos
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File:USGS logo green.svg
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