Barlow, P. M. (2002). Concepts for national assessment of water availability and use. US Geological Survey circular 1223.
Dyfyniad Arddull ChicagoBarlow, Paul M. "Concepts for National Assessment of Water Availability and Use." US Geological Survey Circular 1223 2002.
Dyfyniad MLABarlow, Paul M. "Concepts for National Assessment of Water Availability and Use." US Geological Survey Circular 1223 2002.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.