1.
図書 |
Harry H. Wellington and Ralph K. Winter, Jr.
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2.
図書 |
Gilbert Y. Steiner, with the assistance of Pauline H. Milius
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3.
雑誌 |
Brookings Institution
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4.
図書 |
Jack Stieber
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5.
図書 |
by George W. Bachman and Lewis Meriam
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6.
図書 |
Joseph A. Pechman, editor
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