United States. Department of the Interior. (1994). People, land & water. The Dept..
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रUnited States. Department of the Interior. People, Land & Water. Washington, DC: The Dept., 1994.
एमएलए (8वां संस्करण) प्रशस्ति पत्रUnited States. Department of the Interior. People, Land & Water. The Dept., 1994.
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