eResources by Subject : Marine Sciences
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1971 - present; updated monthly
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1926 - present
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Free Resource
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1967 - present; updated monthly
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Geology of North America: 1785 - present; Geology of the world: 1933 - present
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1981 - present; print indexes available: 1972 - 1980
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Free Resource
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1966 - present with some older content; New citations are usually added to PubMed Tuesday through Saturday.
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coverage varies
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1972 - present
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1978 - present; Updated weekly; print and microform indexes available: 1864-1994
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1972 - present