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KANSAS
SOUTH DAKOTA
5
COLORADO
4
NORTH AMERICA
4
NUMERICAL DATA
4
USA
4
WATER
4
(*LANDING FIELDS
3
*ARCHEOLOGY
3
ALASKA
3
CALIFORNIA
3
DATA
3
FREEZING)
3
FROST HEAVE
3
Humanities and History
3
INFORMATION
3
Ice and Permafrost
3
MASSACHUSETTS
3
MIDWEST REGION
3
NEBRASKA
3
NORTH ATLANTIC REGION
3
PACIFIC NORTHWEST REGION
3
PERIODIC VARIATIONS
3
ROCKY MOUNTAIN REGION
3
SAMPLING
3
SITES
3
SOILS
3
SOUTHEAST REGION
3
SOUTHWEST REGION
3
SURVEYS
3
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