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1Foilsithe / Cruthaithe 1993Ábhair “...Environmental protection Antarctica....”
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2Foilsithe / Cruthaithe 2012Ábhair “...United States. Environmental Protection Agency Evaluation....”
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6Foilsithe / Cruthaithe 1981Ábhair “...Environmental protection United States....”
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7Foilsithe / Cruthaithe 1975Ábhair “...Environmental protection United States....”
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10Foilsithe / Cruthaithe 1985Ábhair “...Environmental protection United States....”
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13Foilsithe / Cruthaithe 2000ÁbhairLEABHAR
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14de réir Fiorino, Daniel J.Ábhair “...United States. Environmental Protection Agency....”
Foilsithe / Cruthaithe 1995
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15Foilsithe / Cruthaithe 1988ÁbhairLEABHAR
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16Foilsithe / Cruthaithe 1973ÁbhairLEABHAR
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