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*ICE
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*OBSERVATION
AIRBORNE
ALPHANUMERIC DATA
1
ARMY CORPS OF ENGINEERS
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ARTIFICIAL SATELLITES
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CODING
1
Civil Engineering
1
DAMS
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GRAPHS
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IMAGES
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Ice and Permafrost
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NAVIGATION
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PENNSYLVANIA
1
POSITION(LOCATION)
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RECORDS
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RIVERS
1
SOURCES
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Snow
1
THICKNESS
1
VIDEO TAPES
1
WEST VIRGINIA
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WINTER
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