Whitehead, R. L. (1994). Ground water atlas of the United States. U.S. Geological Survey ; For Sale by Map Distribution.
Cita Chicago Style (17a ed.)Whitehead, R. L. Ground Water Atlas of the United States. Reston, Va. : Denver, Colo.: U.S. Geological Survey ; For Sale by Map Distribution, 1994.
Cita MLA (8a ed.)Whitehead, R. L. Ground Water Atlas of the United States. U.S. Geological Survey ; For Sale by Map Distribution, 1994.
Precaución: Estas citas no son 100% exactas.