Ground Water Atlas of the United States: Kansas, Missouri, and Nebraska: USGS report on the geology and hydrology of principal aquifers in the region.
Ground Water Atlas of the United States: Montana, North Dakota, South Dakota, Wyoming: Online USGS report describes the groundwater resources of this 4-state region.
Lewis and Clark Rural Water System: Regional water planning organization in South Dakota, Iowa and Minnesota.
Saving Water, U.S. Farmers Are Worried They'll Parch: New York Times article about progress of water conservation and future supply outlook in the region served by the Ogallala Aquifer.