The guardian : origins of the EPA
著者
書誌事項
The guardian : origins of the EPA
（EPA historical publication, 1）
U.S. Environmental Protection Agency, [1992]
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注記
Cover title
"Spring 1992"--P. [2] of cover
The guardian : origins of the EPA
（EPA historical publication, 1）
U.S. Environmental Protection Agency, [1992]
Cover title
"Spring 1992"--P. [2] of cover