ocean |
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oceanic |
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SN | A valid term through 1977. See oceanic crust. |
oceanic ridges |
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SN | A valid term through 1971. After 1971, use mid-ocean ridges. |
oceanic type |
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SN | As of 1981, no longer a valid term for GeoRef. Use oceanic crust. |
Oceanography (category) |
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SN | Oceanography (including marine geology), GeoRef category code 07, is one of thirty categories used to classify documents in GeoRef. Each reference in GeoRef is assigned one or more categories. Categories can be used, in addition to Terms, to refine search |
oceans |
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SN | A valid index term through 1977 used in combination with circulation (i.e. oceans, circulation). After 1977 use ocean circulation. |
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