United States. Office of Surface Mining Reclamation and Enforcement. (2002). Keep out: Old mines can be dangerous. U.S. Dept. of the Interior, Office of Surface Mining.
Chicago Style (17th ed.) CitationUnited States. Office of Surface Mining Reclamation and Enforcement. Keep Out: Old Mines Can Be Dangerous. Washington, DC: U.S. Dept. of the Interior, Office of Surface Mining, 2002.
MLA (9th ed.) CitationUnited States. Office of Surface Mining Reclamation and Enforcement. Keep Out: Old Mines Can Be Dangerous. U.S. Dept. of the Interior, Office of Surface Mining, 2002.
Warning: These citations may not always be 100% accurate.