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T. 1: 526 S. - Ill., graph. Darst., Tab.; T. 2: 602,LVII S. - Ill., Kt., Tab
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Published: Washington/D.C : U.S. Government Printing Office, 2006
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Published: Washington/D.C : U.S. Government Printing Office, 1998
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Published: San José, Costa Rica : Bilance, 1999
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