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1.http://adswww.harvard.edu/
The NASA Astrophysics Data System
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5.http://www.cdc.gov/
Centers for Disease Control and Prevention (CDC)
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6.http://cogprints.soton.ac.uk/
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7.http://www.access.gpo.gov/su_docs/databases.html
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8.http://www.icpsr.umich.edu/index.html
Inter-university Consortium for Political and Social Research (ICPSR)
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9.http://www.nationalacademies.org/publications/
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10.http://www.cdc.gov/nchs/
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12.http://promo.net/pg/
Project Gutenberg Electronic Public Library
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Thomas Legislative Information on the Internet
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14.http://unesdoc.unesco.org/ulis/
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15.http://www.usgs.gov/
United States Geological Survey
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16.http://www-wds.worldbank.org/
World Development Sources (World Bank)
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