Christian Leibundgut, Piotr Maloszewski, and Christoph Külls. John Wiley & Sons, 111 River St., Hoboken, NJ. 2009. Hardcover, $99.95. ISBN: 978-0-470-51885-4.

The use of tracers in hydrologic studies has shown to be valuable at spatial scales ranging from a laboratory column of a few centimeters to watersheds and aquifer systems of hundreds of kilometers and at time scales from a few minutes to many millennia. Tracers are divided into two general categories—environmental or artificial—depending on how they enter the system to be studied. Environmental tracers enter the system as part of the hydrologic cycle and can be natural (e.g., stable...

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