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Unconsolidated sand and gravel principal aquifers of the United States, which are characterized by intergranular porosity and all contain water primarily under unconfined, or water-table, conditions.
Unconsolidated sand and gravel principal aquifers of the United States, which are characterized by intergranular porosity and all contain water primarily under unconfined, or water-table, conditions.
Unconsolidated sand and gravel principal aquifers of the United States, which are characterized by intergranular porosity and all contain water primarily under unconfined, or water-table, conditions.
Unconsolidated sand and gravel principal aquifers of the United States, which are characterized by intergranular porosity and all contain water primarily under unconfined, or water-table, conditions.