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Use SET to add a constraint and CLEAR to remove it. Constraints are combined; with none set, every sample is returned.

Set Geographic Bounding Box Clear Geographic Bounding Box Geographic Bounding Box Inside a drawn polygon (4 points)
Set State, Territory, Province State, Territory, Province no constraints set
Set Volcanic Field Volcanic Field no constraints set
Set Age Age no constraints set
Set Chemistry Chemistry no constraints set
Set Rock Type Rock Type no constraints set
Set Reference, Keyword Reference, Keyword no constraints set
Set Data Available Data Available no constraints set
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