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110 _aNational Science Foundation
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245 _aSpecialized science information services in the United States ; a directory...
260 _aWashington :
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300 _a528 p.
490 _aNSF 61-68
590 _aBATCH-UPD
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590 _aBATCH-UPD
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590 _aCONVERSION
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650 1 4 _aBiología
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650 1 4 _aFísica
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650 1 4 _aInstituciones científicas.
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830 0 _aNSF 61-68
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901 _aBK
942 _cLIBRO
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