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tblGeoLevel2(Level1ID, Level2ID) acts like a primary key for tblLocalities(Level1ID, Level2ID).
tblGeoLevel4(Level3ID, Level4ID) acts like a primary key for tblLocalities(Level3ID, Level4ID).
tblTimePeriods.TimePeriodID acts like a primary key for tblLocalities.TimePeriodID.
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