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54 Environmental Sciences
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58 Geosciences
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99 General And Miscellaneous//Mathematics
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And Information Science
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Antarctic Regions
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Arctic Regions
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Computing
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Oceanography
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Program Management
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Research Programs
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580000
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580000 -- Geosciences
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990100
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990100 -- Management
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Air Transportation
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Airline Industry
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Airlines
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Airports
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Aquatic-- Basic Studies-- (1990-)
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Basic Studies
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Bridges
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City planning -- Oregon -- Portland
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Document Types
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Flight Arrivals
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Frozen ground
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Geosciences
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Land use -- Oregon -- Portland -- Planning
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