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5圖書出版 1972“...Resources for the Future (U.S.)...”
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8圖書“...Resources for the Future (U.S.)...”
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13圖書“...Resources for the Future (U.S.)...”
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15圖書出版 1972“...Resources for the Future (U.S.)...”
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19圖書出版 1969“...Resources for the Future (U.S.)...”
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